Should I be worried about her?

I'm talking about my mom, Caucasian and 46 who is hosting my distant cousin from the States. Mom usually wears tees and shorts at home, however, since she confirmed his visit, she went shopping for micro shorts that show a tiny bit of her cheeks. I've never seen her go for something like this, and I caught him staring at her. The next day, she wore the same shorts and he was at his work again. I tried talking to her about the same, but she brushed it off saying it's a coincidence and she wanted to buy those shorts for a long time. She says she got a hefty discount on the same. She didn't try to adjust her shorts, and seems hell-bent to flaunt no matter what. I am concerned. What should I do?

Should I be worried about her?
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