My husbands daughter doesn't want me coming to her gender reveal: Advice?

My husband oldest daughter is 27 and she is having her gender reveal party this weekend. She does not want me to go with him to the party (she called him to ask him and make it clear) The party is at her mom’s house. I know her since she was 7 y/o and she never liked me. I was never the reason her parents broke up since my husband was single when I met him and he was leaving with his mom to help his mom with mortgage.He is going to the party regardless of what I say or feel. Please tell me how do I handle this situation. It makes me sad and uncomfortable because I always try for her to like me but she never did. When she was 18 or 19 I can’t remember she said sorry to me for how she was all those years and she blamed it on her mom. But after 1 year of that she started to be mean again. My husband said there is nothing he can do about it and how to change her thoughs…