It is confirmed that Eva was poisoned by Cora, however it is never stated how it happened. Jared S. Gilmore said in an interview that Cora poisoned Eva with magic, but that didn't really specify what had happened. I wonder if she drank wine that had poison in it, or how she exactly got poisoned. I kind of think she was poisoned with dreamshade, but it is kind of unlikely, because of how long it took for Liam to die, or for Gold and David to succumb to their dreamshade.
I'm not a doctor, but personally, I'm quite sure Cora didn't use Dreamshade to kill Eva. Watching the episode The Queen Is Dead once again I noticed that Eva vomited small amounts of blood.
Dreamshade kills differently. All victims of dreamshade have in common that - wherever the wound is - black veins spread around it (Liam cut his arm (Good Form), an arrow nicked David). In time the black veins spread further. When they reach the heart the victim dies of cardiac arrest. The creators gave us the opportunity to watch the effects of dreamshade twice. Neither David (Good Form) nor Mr. Gold (The Miller's Daughter) vomited blood. They both felt feeble and weak, having difficulties to bring up even enough strength to keep up with the rest of their company. Dreamshade affects the heart of its victims. Hook thrusted his hook into Gold's chest that's why Mr. Gold had a bloody cloth when Emma visited him. Thrusting a hook into someone's chest itself causes a deep wound, he was trying to stop the bleeding.
Neverland is a land of magic. Magic is a natural part of Neverland. The plant Dreamshade is native to Neverland. In my opinion, Dreamshade itself is not magicial. I'd rather say Dreamshade adjusted to the environmental conditions of the island. Comparable with a cactus, which is able to grow in deserts because it managed to adjust to heat and shortage of water, Dreamshade adjusted to the environmental conditions of Neverland. In countless years of evolution Dreamshade learned to tolerate Neverland's environmental conditions. The plant learned to tolerate magic. Maybe Dreamshade even requires magic to grow.
I don't know when or where Jared said that Cora used magic to poison Eva.
One of the basic rules of magic is that magic cannot bring back the dead, unless you trade one life for another. Neal had to die in order to resurrect his father. (Quiet Minds). It's also known that light magic can undo dark magic (e.g. There's No Place Like Home: The Blue Fairy transforming Snow White back into human form after Snow used dark fairy dust (= dark magic) on herself and had transformed into a lady bug.) Of course in order to undo a curse with light magic the victim of the curse still has to be alive.
In the Land Without Magic vomiting blood might have various causes. Poisoning is only one of them. Before Cora revealed to us that she poisoned Eva my first thought was, Eva might have fallen ill with tuberculosis.
It's possible that Eva was poisoned by magic. However, no spell known to me causes the victim to vomit blood. All I can say is, that for the reasons I listed above I don't think it was Dreamshade that poisoned Eva. I'm not familiar with the flora of the different worlds we've visited so far. There might be countless ways to poison someone without using magic and even more if you use magic. Probably, we'll never know for sure.
I agree. Even if Eva was a bit rude to Cora, that was horrible of Cora to manipulate Snow into letting her own Mom die, when her Mom hadn't even reached that age (near death age) or half that age. I think Cora gathered Nightshade and mixed it in a potion and then disguised herself as a servant, mixed it in a cup of wine which she gave to Johanna, who gave it to Eva. Eva drank it and then succumbed to its effects.
Dan Fox wrote: I agree. Even if Eva was a bit rude to Cora, that was horrible of Cora to manipulate Snow into letting her own Mom die, when her Mom hadn't even reached that age (near death age) or half that age. I think Cora gathered Nightshade and mixed it in a potion and then disguised herself as a servant, mixed it in a cup of wine which she gave to Johanna, who gave it to Eva. Eva drank it and then succumbed to its effects.
Eva wasn't "a bit rude" to Cora. She destroyed any chance Cora had to have a good life. She forced Cora to give up her first born. She humiliated Cora in front of her future husband and father-in-law. Quite frankly, I would've killed Eva as well. Plus as described above, Eva's death seemed nothing like Dreamshade. If I had to guess, she probably turned into a fly (as we know she could shapeshift) and personally pricked Eva with an illness. It seems like the kind of thing Cora would do.
Dan Fox wrote: I guess I would kill Eva myself too, but I wouldn't involve her daughter into it. That was the real cruel part. I guess the notion was "You ruined my daughter/s. Now I'll ruin yours."
Well, Cora just wanted to completely decimate Eva and Leopold and turning Snow into the darkest creature imaginable was the perfect way to do that. Shame that she wasn't able to personally kill Leopold herself.