I need to vent...so last month my stepsister had her bday...we are really close her mom , my (…

I need to vent...so last month my stepsister had her bday...we are really close her mom , my ( stepmom) has raised me pratically since I was 6...well we had to cancel going the last min because bills weren't going to get paid if missed...so I texted her mom apologizing and gave her the reason..I got back a text basically ignoring that we had shit to handle...no she hasn't once texted me , called, didn't even show up to my baby shower ... I'm fucking pissed no way in hell I'm being the bigger person here because I'm me and I have feelings too...she can always be straight up with me and I can't be salty but now she can because I missed a birthday party? fuck her.