Sometimes this site can provide incredibly varied, intelligent and well-articulate points of view. Sometimes not. Online gaming is a ‘sometimes not’ area, and a stark reminder that Mumsnet is overwhelmingly used by middle-aged ladies. ‘Gambling’ indeed!
OP, to a lot of posters on this thread, online games aren’t ‘real’ in the same way a Monopoly board or a deck of cards is real. Their definition of ‘real’ is something physical you can interact with in the real world.
When a child asks for money to spend on an online game, all they see is the money disappearing into the ether. Robux aren’t ‘real’ to them (just wait til they hear about bitcoin!). If you’d said ‘my daughter wants to spend £92 on lego’ there wouldn’t be this problem because lego is ‘real’. They know what lego is, they can touch lego, they understand how the lego will be used. They're basically saying 'you are stupid for letting your daughter spend money on something that is meaningless to me personally'.
For the question ‘should I let my daughter spend £92’ I’d personally want to know exactly what she was going to spend it on and why. I think I’d be inclined to say she can have £10 a week or something, to avoid any nasty surprises.
Ignore the people saying she’s too old to be getting scammed and is therefore daft. We don’t know what happened so we can’t make that judgement call. If it was something REALLY silly on her part then fair enough, but in general most scammers are clever and people of all ages get scammed in all sorts of ways all the time. Regarding the trust trade, well, she probably won't be doing that again! (if she does, THEN you have a problem).
In the end, it's her Christmas money. She can spend it how she likes, surely? Then once it's gone it's gone, and if when it is she wishes she had some left, she'll use it differently next time?