I guess I'm getting older and more feeble with my advancing years. I had to go look up "Hot or Not." So, it's a site where you have to register. Then post a picture. Then get rated, thumbs up or down! Thank God I'm technically illiterate. I'll just echo the response from others....don't post pictures unless you are ok with being outed.
I'd just ignore the text. If she confronts you, then I'd ask her to explain what she is referring to. See if she shows you the pictures. Maybe she did not save them. If you are forced into a conversation, then ask her to explain what she has against cross-dressing or transmen and women in general. Don't be forced to defend yourself. There is nothing to defend. Ask her if she has issues with gays and lesbians also. Put her on the defensive.
Also, take down the picture. And, maybe you should take down your picture/avatar on this site too. If she or her daughter get inquisitive, they may decide to start perusing sites to locate you. As was said on another thread there are probably researchers, giggly girls, and others who are not a member of the cross-dressing and trans community on this site.
PS: I put occdresser into my search engine under images and your avatar popped up as well as pictures of other women of this site.