Is she claiming that sending you pics of documents is the same as giving you actual documents?
It sounds that she’s preparing for the courts by portraying herself as a dutiful mother and fully cooperating soon to be ex spouse. She wants you to look like you aren’t cooperating.
I hope you are saving everything she ever sent you as well as have evidence of her not replying to your inquiries about important things.
Oh she definitely tried to claim the youngest and is now playing dumb