I'ts totally up to you, but I think it's worth chancing it without the stuff. It is only 5 hours at the end of the day, the flight staff are WELL used to little ones and I'm sure they will help - she may even surprise you.

Sticker books rock btw.

I was so nervy about the whole phenergan thing that I chucked the bottle the next day because I couldn't relax giving it to her (then I watched her climb the walls anyway)