Religion question about Muslim Women

So i Have this friend who married a man whos Muslim. She's is/was Catholic and is Mexican. She post pictures of herself wearing head scarves from time to time. She states she isnt muslim but will wear start wearing a hijab and eventually every time she goes out. Im not muslim but, i feel like she's wearing it for a fashion statement and it just looks wrong while other pictures shes in a bikini or something. I know its not my place but should i tell her something? Or can she wear a hijab like that? I apologize now if i come off ignorant for any reason. I honestly want to know and be more educated about this subject.