it sounds very normal on her part , let me explain the human nature is such that it hates to be indebted to someone so the more we give to somebody the the less time we hear thank you ,when was the last time a child said thank you to a parent , when was the last time we said thank you to Hashem , but if some stranger does a smallest thing for us we shower them with all the blessing , why is that ? because nobody wants to feel inferior , nobody wants to feel like they need someone , nobody wants to feel like they in need of anything , so it is very normal for someone to whom one gave so much to distance one self and not to have any connections, But in the same time she needs all of you more than you need her and she herself knows it very well but she will never admit to that , so this my humble suggestion
try to get the relationship back , start slow maybe send her something like a card or an en email or just something else just to get her attention and build slowly , forget all the misunderstanding don’t even mention it unless ofcourse she wants to but otherwise forget about it, in the beginning she will be cold and not friendly but eventually she will be back to her self and guess what you won !!
hey you have nothing to loose but soo much to gain !!!
hazlocho