Annoyed about fiances mother

So I've posted on here before about how my fiances mother is pretty nonexistent in my sons life despite living a mile down the road. She doesnt call, answer her phone or return messages but yet will cry these big crocodile tears that we keep him away from her.

Anyways, we are expecting baby number 2. We had a 4th of july barbecue where we also announced the gender of our new baby. She made an excuse not to come and from that point on I have decided that I just want nothing to do with her. My children are better off without her in their life anyways (she makes really poor life decisions such as drug use and stealing) and I dont need her around trying to make me feel guilty for my child not knowing her when its honestly on her for not coming around at all.

Yesterday while I was at work my fiance messaged me and told me he stopped by his moms and dropped off pictures we had done of our son. Now by all means I dont expect him to not carry on a relationship with his mother because that is his mother. But I'm frustrated because I dont think she should have any pictures of our children. I told him shes just going to show off the pictures and act like shes a grandma to him when she literally never seems him, makes an effort to come to important events regarding him or anything. I just feel like if she clearly doesnt care to be a grandma towards him why go out of the way to make her feel included? I'm just done trying with the woman and like I said previously shes not that great of a person anyways.

I don't know if I'm just being extra hormonal and emotional or if I have a right to feel the way I do.