step mom withdraws her love

so I woke up today and saw my dad was tagged in a picture by my step mom on fb. I clicked her profile and went to see if there were more pictures. well there was, and she had unfriended me. I'm getting so sick of her doing this. Everytime even one of us (me, my brother, my sister, my step sister, my step niece & nephew) pisses her off, she decides ALL of us can just "get the fuck out" of her life (she's used those exact words before). So now none of us are friends with her on fb. She just deleted all her kids. She has been around since I was 3 years old. She's my other mama. Yet she withdraws her love whenever she feels like it. I'm so sick of being treated like an optional child. She changed her number too because now it says her phone number has been disconnected. ughhhh. I'm so over her jerking the family around like this. she expects us to flock to her side asking "What's wrong what's wrong what did I do" but she is a MOTHER. we shouldn't have to ask why she's cutting us out of her life because she shouldn't be cutting us out of her life! And my dad just fuckin goes along with it and pretends everything is fine and she has a right to treat us like shit.