am I overreacting? So DD's bio signed his parental rights away so DH can adopt her. He's in prison…

am I overreacting?

So DD's bio signed his parental rights away so DH can adopt her. He's in prison will be there until at least she's 13. This is been in the works for a bit and I still have contact with my ex-mother-in-law. She's out of State. Has never really been too involved with my daughter. But we did talk on a semi regular basis. The whole time she was telling me my husband adopting her was a good thing. Now I made clear she didn't have to agree with my decision as I understand she's my ex's mom. But she was a right there telling me she can't wait for it to happen. Well my ex calls today so I decided to talk to him to thank him for signing the papers. Because I know it was hard. Come to find out it was his mother that was keeping him from signing the papers. The whole time she was in his ear telling him how it was horrible and he shouldn't do it. Like he would have done that the first time I asked him if he didn't listen to his mom. I am legitimately pissed off because this woman is two-faced. And a straight-up liar. She didn't have to tell me what I knew I wanted to hear to be able to check on my daughter. I am not that shallow. We have always had a rocky relationship but come on. It really pisses me off when someone lies to me. Is it wrong that I'm angry? Is it wrong that I'm questioning having this woman involved in my child's life? because I have no ideal what kind of things will be said behind my back...