Jill did not send her mother a christmas card. Other than Jill, no one knows what the reason for that is...personally, I think it was an oversight based on being in new territory (first time they haven't spent Christmas together).This, however, does not mean that she didn't call her mother or that she hadn't talked to her since then. IMO there is a difference between messing up and overlooking what might be considered common courtesy and "ignoring" her mother.
Remember that just because you didn't see it doesn't mean it didn't happen. The conversation with her mother today was a) much longer than what you saw and b) one of MANY conversations along the path to improving her relationship with her mother. There were many more acknowledgments and levels of ownership from Jill that for whatever reason did not make the show.
Yes I know Jill. Say what you will about her I can tell you that she has worked very hard at strengthening the relationship with both her mother and her father. I can not imagine trying to balance those relationships at this stage in her life...how do you build a relationship with a man you never thought you'd know? How do you do this without your mother feeling abandoned and betrayed? And how do you negotiate all of this while trying to grow your newfound "self-hood." Probably most significant is how do you wrap your brain around being a daughter with a present father when you've never had that experience?
Has she had some mis-steps? Yes. Will there be more? Probably. I, for one, think it takes courage to explore these things period...much less without the world watching.
All of this to say, bash her if you must for her inconsideration, oversight or whatever, but know the facts. She didn't send a christmas card. Everything else is speculation, rumor and untrue.