I will do this only I will have an adult fill it before she comes and we will pretend as if she knew nothing about it. But in reality she can have some really fun stuff in there , the whole time the youth thinks that actually what she always carries in her purse. She will have an answer to all contents. This could be hilarious.
I would never do this to a youth leader without asking them well in advance so that there is nothing that could be embarrassing to be found.