EDIT: Mother in law feeding my 5 month old eggs.

Y'all I really would like to cut her off from my child but we live under the same roof with her and I don't know what else to do. What can happen to my child if she doesn't stop this? It isn't the first time she has fed my child things that she isn't supposed to be eating at this age. I also forgot to tell y'all that my child is starting to refuse her formula. I dont know if it from the food or what I'm so worried.