i'm picking up on your being very hurt due to her treatment of you. she sounds rude and inconsiderate to me. and selfish. it's not unreasonable for your feelings to be hurt. mine sure as hell would be. and she can cry and storm around all she wants, she knows exactly what she is doing to you. there! send her to texas!
i can think of things to get even with her, but we both know that neither of would resort to anything childish, so we won't even go there.
the only thing that i can see you doing is to lower your expectations of her. talk to your T and work out a plan for your heart and head. i've been in similiar situations and it hurt me a lot to feel left out and overlooked. my own sister paid a photographer to take family pictures about a year ago and who, in the family, is a professional photographer? it really hurt my feelings that she did that. didn't even ask me to do it. family can suck at times. there, i said it. suck!
love ya, agnes.............xoxoxo ethel