How can I help my friend?

My friend who's 17 used to be very intelligent, sensible and great to hang around with. She broke up with her boyfriend of a year a few months ago, and since then it's all gone downhill for her. We started college last year and she's begun to dress a lot more revealingly and inappropriately. She wears crop tops, skirts, dresses and skin tight jeans all the time. During winter she dressed like it was summer. She has a stunning body (she's a dancer) and she looks pretty so she's getting plenty of male attention (just to spite her ex, who she still has feelings for). She's also giving up on her education basically; she's really intelligent but she's simply not trying anymore in maths because it requires effort, and she always moans that she's going to fail. She's turned into someone completely different, and recently told me that she was going to make a thing of leading guys on then sacking them off for, and I quote, 'banter init'. What can I do to help her? I don't know how to make her see how ridiculous she is being. Posted from TSR Mobile

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