You ARE going to be spoilt, Calle!
You won't want to leave the ship. If Lily is your maid, you will think you are in heaven. She is Russian and used to work on the Disney ships. She makes folded towel animals for the beds. She was our maid on the Mother's Day cruise. I tried to change my cabin to one of her's for the crossing, but all of her cabins were taken. :\\\'(
If you are talking daytime wear, I'd go for things you can wear in the UK instead of Florida hot weather clothes. Unless you will be living in the south, you really won't need tank tops and shorts. And it will be cool while you are at sea. I keep my Florida clothes packed in a suitcase while I'm in the UK.
Your daughter could probably wear any of her dresses with a shawl or wrap when she's going to the dining room. I'm stereotyping here, but I imagine she has some of those flirty, layered short dresses that are so popular with (and look so great on) teenaged girls. Pull out the prom dresses for the formal nights. Oh, and I don't think they allow parasailing on the ship, but it's one of only a few activities they don't have.
Let me tell you one travel tip. Get one of those plastic multi-pocket shoe keepers that hang on a door. Fill it up with everyone's toiletries, roll it up, and pack it. When you get on the ship, unroll it and hang it on the bathroom door. There's very little space in the bathroom, so this will keep everything neat and accessible. And your room attendant will love you!
As I think of things, I'll post them. Please ask away.