A friend of mine has a picture up that was taken 10 years ago. Firstly, it's a head and shoulders shot, and secondly, she's gained about 50 lb since then. And surprise, surprise, she is having rotten luck with the guys she meets.
I do not think she is deliberately trying to deceive; my belief is that she likes that picture of herself and doesn't realize how much time has flown since it was taken (and how she's changed in the meantime). I don't want to say anything because she is very sensitive, but I think if she'd just post an honest, up-to-date picture of herself, she could attract guys who are interested in her just the way she is, right now.
You might want to encourage her to not so much take that picture down, but rather encourage her to put up more
photos in addition to it.
As I said upthread, when I internet dated, I maxed out on photos - as many as I was allowed I had. I had face pictures, solo pictures, with friends and family pictures, me doing stuff (I think I had one horseback riding, one skydiving, one with friends at Cirque Du Soleil, etc).
I figured a lot of pictures told a story about myself as much as my written profile - it showed I had friends and maintained relationships
with family, it showed some of my interests, it showed my personal style, etc. And with guys I appreciated lots of pictures - you can tell if a girlfriend is cropped out (sign of a recent break up perhaps?) or if a guy has a dog, or there were plenty of guys with pictures with what appeared to be their kids yet none were listed on their profile, etc.
So maybe appeal to her like that "friend you have such a great and well rounded life, maybe putting up more pictures of yourself would help attract a better caliber date - guys who really saw you for you and appreciated all you have to offer! A picture tells a million words, best to have plenty up to really tell who you are."