i think there's nothing wrong with a bit of pampering now and then, or a little bit of make up for special occasions if the girl is not *too* young- but 10 year olds wearing make up regularly and wanting waxes etc really is ridiculous. being so conscious of such things at such a young age will surely give them a negative self image?
children seem to grow up so quickly now, it's sad. i saw a documentary about this a while ago where a 9 year old regularly had tanning treatments, manicures and so on and was generally treated like a little doll so her parents could enter her into child beauty pageants. this is pretty sick in my opinion, although obviously a bit different from what you posted about, it's not right.
also like others have said wearing cosmetics so young will probably upset sensitive young skin and lead to blemishes