I would not make assumptions beyond she is wearing what she wants to wear.
I'm not convinced by the "she is dressing like this because she is forced to by her employer's" line. If employers have a dress code it is far more likely to discourage short skirts and skimpy clothes than encourage.
I found myself looking at the heels and then spotting the bra. I thought 'Jeez if I'm doing this, then I guess this young woman is getting similar and worse all day from men?
Possibly/ probably/ who knows?- but you would have to ask her whether she (a) notices (b) cares and (c ) likes or dislikes the attention it generates. And tbh I find that comment slightly creepy.
By way of example I dress in a way which I want people to notice - my clothes are highly tailored, unusual , expensive and not High Street. And it pleases me to be noticed and get compliments.
She may be, like me, consciously dressing in a way to attract attention (albeit in a rather different way from me).
Whether she is dressing this way because of patriarchical oppression on women to look sexually attractive at all times or because she likes it will I suppose depend on whether or not you think women are capable of deciding how they want to dress.
I'm a teeny bit sceptical about "heels so high she can hardly walk" - that sounds rather like the stock descriptor on FWR of any heeled shoe.