Toxic cousin

ki

So I have a cousin that has been talking crap about me behind my back. She went to my gender reveal a couple months ago and didn’t say hi or congrats; yet she sat there eating the food and getting drunk off the alcohol I bought. I’m pretty sure she’s going to my baby shower next week and I feel like telling her something. I don’t want to feel uncomfortable at my own baby shower. Would should I do or say?