Is it OK for my girlfriend (mother of my 2 kids) to except gifts from her approving mom?

My girlfriend has 2 kids from a previous marraige. Her mom doesn't approve of me, and convienently still talks to her ex (out of the fact that he picks kids up sometimes from the moms house.) Im pretty sure he is the one that tainted her mind when she quickly went from being my supporter to, out of the blue, telling my girlfriend that "God told her that I was a bad person". Now, she has been out of our lives for a little over a year or so, and is slowly trying to ease back into our lives by buying gifts for my girl (her daughter). Thats not the problem. The problem lies with the fact that she doesn't get me anything. She has chosen to not be involved in our 2 kids lives. She buys them gifts, and not me, as if she doesn't have to recognize me at all. Just sends gifts at the normal occasions. I am not wanting the gifts, I want to be treated like I exsist. I am wondering if I am just being a child or are my hurt feelings valid. I support my family yet I am not recognized.