I'm a father of 5 girls. I've navigated the teenage dating/prom/homecoming drama with 4 of the 5 girls (the youngest is still 10, so I have one more).

The fact of the matter is that teenagers today simply don't date. It's not something they do. If a teenager has a steady boyfriend, then they will have a date to homecoming or prom or something. A very small handful of other girls will get asked out on a date for a big dance. For the vast majority of the other girls, they go dateless. It's just how the world is in 2021. Guys aren't willing to go out on a limb and ask a girl on a date, even if it's historically expected of them for things like homecoming or prom.

What typically needs to happen as a reaction to this is for the kids to go as a group. This is what has been happening in my area for 10-15 years. It's mostly instigated by the girls, who know there's a very small chance that they're going to get asked on a date unless they have a steady boyfriend. They start planning a month or two in advance and organize a group of friends to go to the dance together. They'll usually plan on going out to eat at a restaurant together before hand, and they'll arrange rides together and go to the dance together. They might coordinate with 6-10 girls, and maybe invite some boys (who they might like but who don't have the testicular fortitude to ask them on a date) to join the group.

That's just generally how it's done now. Teenage guys won't ask girls on a date for the most part. So the girls need to take it upon themselves to make the plans to go to the big dance and make the very best of it themselves.

If you look at facebook where moms post prom pictures the day of prom in my area, it's probably a 80%/20% split. 80% of the kids are going to prom with their group instead of on individual 1 on 1 dates. 20% are matched up one-on-one, and the vast, vast majority of those are kids who are formally dating steadily. When you see someone matched up on a 1 on 1 date in a prom picture and those two kids aren't dating steadily, your first reaction is to say "wow, I didn't know they're dating." That's the assumption if you see a guy and a girl on a solo date to prom or homecoming because actual "dating" as we know it is pretty much dead.

TLDR version: Tell your daughter to organize a group to go to homecoming and make plans to have a blast together as a group. My daughters who went with groups to prom/homecoming/etc actually had a lot more fun in the group setting than they did during the times when they went with a date. It's a different dynamic, and it can be a lot more fun if you do it right.