Older mother here, who's done it herself as a teen and then negotiated teenagers. Just my thoughts.
I'd sit her down, treat her like an almost adult and have a conversation. What does she want? What can you live with? ( Clue, 11pm to 12pm is reasonable. you can go in a bit earlier and settle for anything before 11 to midnight, depending on the rest of the deal.)
How many? Maybe, who? What does she envisage? You can chuck in a a few snacks, pizza, a few cans of cider and some soft drinks maybe as part of the deal. You get to have some lines in the sand - eg cleaning up, trusted friends and NO posts on social media ( but you need to accept she may not have total control about that, so have a chat about who's coming etc, present this as a risk etc).
I get it, it's a scary age, it really is, but please don't muck it up from the start or hang her out to dry. This is a actually a good learning opportunity for you both for your relationship going forward. Don't be a wuss, but do listen to her and give her a chance to prove she can be trusted - couch it in exactly those terms.
Good luck, and remember, they are not that age for ever. 😊