can i have an opinion?

I was in the same situation a few years ago, actually. If there are going to be other people at the sleepover, it might be best to ask to talk to her privately. If it's just you and her, it might get odd if she doesn't feel the same way.

I would suggest asking her how she feels about you first. That way if she doesn't feel the same way you do, you'll know before you tell her how you feel. It might make things a little easier to talk about.

Hope things work out well for you.

thanks

Has she given you any indication that she may feel similar feelings? I'd agree with Monika - it might make things odd if its just the two of you and she doesn't feel the same. Maybe you could steer the conversation round to crushes in general and see if you can find out if she ever liked anyone she knows. You could also ask whether she's ever liked a girl before. If she says she hasn't or you get a bad reaction then you might be that she won't feel the same. Fingers crossed you get a good reaction though and good luck.

good idea thank y'all ^__^

And? Did you tell her? I personally think it's not smart to tell it during a sleepover... If you want to, do it on a Friday, that way, when she doesn't have the same feelings, you can give her and yourself some to let it sink. (Don't know if you know her from school, but when you do, this can help).

I also agree with the other tips from Monika and Arty.
Good luck!