I love her dress and they look happy--I hope they had a great time! My son's senior prom was last night, too. He went with a group of friends, which is what he said most of his class did unless they were already seeing someone. He tends to be anti-dance, so I was just happy he went!
I don't know of any prom specific kits, but I'll probably use a New Year's kit to scrap the few prom photos I have. (He and his friends didn't get together for photos first, so I have some of just Jason, one that was taken and printed at the prom of his group, and possibly a few his friends send that were taken there.) Here are a few that might work for you, too:
I love the 2022 balloons and other elements in Meg's kit, but it's too pink and purple for the photos I'm scrapping. I'll probably go with Toasting the Day and use things like the congratulations banner, disco ball, etc.