Board Thread:General Discussion/@comment-908565-20180809021905/@comment-25375217-20180809032338

Yeah, this has been discussed a few times. Canonically, it's just an inconsistency -- Adam and Eddy may have had a plan for it, but it's not like we'll ever get to see it now.

The leading headcanons are that A) Cecelia is still alive, or B) time moves backwards in New Wonderland, explaining Alice's clock as well as why she isn't older than Emma despite being born around the same time.