Would you be upset if your MIL...

I'd like to hear your opinions. So recently my MIL gave my 2 year old daughter a gift and on the card she signed it with her grandma name and then next to that she wrote Mama. Why is she calling herself Mama to my daughter?! Obviously my daughter cannot read so was she just trying to make me upset?

So if this was the only thing then I could brush it off but she has shown herself to be very manipulative to not only my husband but her other grandchildren as well. There is way too much to get into in one post but I never leave my child alone with her ever because I never know what she will say to her. I refuse to let her manipulate my daughter.

So what would you think/do if this was your situation? I definitely need advice here.