What do you do if Com's to choice between your child or your partner.?

i have a daughter from my previous marriage my X refuse to take care of her so she end up with my mother .i never thought that i ever going to get marred again. until i found my self in love with another girl that she was 9 years younger then lam by then she never mention that she will ever be between me and my daughter. but little by little after we had three wonderful boys to gather she changed totally against my daughter.. now i cant se her i cant Support her i cant bring her to leave with my family in time she needs me the most and im the only one she have in the hole world she leaves very far a way with my disabled mother in a world full of crime and human rite valuation there is no Minot gos by that i don't thing about her and gilt is eating me alive.well heir Com's my question what should i do?