My first question would be - do you think she needs the waxing? I know DD1 is very hairy and has very thick eyebrows like DP so I am guessing by that age she may have asked me already and I think if it is something that really bothers her then I would consider it.

As for make up I would probably say no but allow a bit of blush and lip gloss. That way she still fits in but it's not over the top and you don't have to spend extra money.