I'm a step mom.....

I have raised my daughter since she was only 1 yrs old. She is 3 1/2 now & although I have respect for her mom & I'm civil around her I dislike her. I wished her happy mothers day last yr & we asked her if she wanted her on that day even though by court it's our day & she said no. So today she calls my bf & tells him to pick her up& he said hes off at 2pm & shes like well cant she pick her up (me) . & he calls me & asked me if I can pick her up& I told him I was out running errands & if she can just wait til 2. So to me that means shes obviously going out somewhere & doesn't want to take her like always (it's not the first time). Than I told him well its mothers day do you think she wants her today? & he said no "she has plans". Well that pisses me off. I mean I'm glad I get to have her today but I just dont understand what mother doesn't want their child with them any day they can get. I'm just disappointed in her because she has another kid with the guy she left my bf for & that kid goes everywhere with her. & it breaks my heart that my daughter loves her momma so much she will never know that she abandoned her when she was born to be with another guy & party. & when I came into her life her mom fought for her custody because she was afraid of her calling me mom & not her (which I totally understand). But I was expecting her to be a good mom & she isn't. she left her with the current bfs friend(guy) to go out & party when she was with him for only 3 months. there is so much she has done & still does & my poor baby only wants momma when shes away 🙄😢 so sad.

Has anyone gone through the same thing?