Here is another thought.
Perhaps she is tall woman and has a preference for taller men.
Or perhaps she is a larger woman, and thinks a "skinny" or average build guy would not accept her because she is a BBW.
I had an issue like this once. I had a several month chat relationship with a woman in the chat room. She finally got around to telling me she wanted a picture of me, I told her I had one in the members pics area. And she went off to go look. She came back in the room but would not respond to any of my PM's which after about 3, I went ahead and called it quits. I was not going to harass her if I was not her type.
About 3 days later I was still wondering at times what the deal was and sent her a PM, that said...nicely and respectfully,"I was just wondering if you were OK. After you went to see my picture, you no longer wanted to chat with me. And I understand, and its OK. I was just wondering if it was something about me or something I did. If you do not wish to answer that is fine, I respect your decision and will not message you again. I just wanted you to know no matter what you are a great person and I appreciate the time we chatted. Your Friend, Rob."
She did respond about 3 days later, and told me that after she saw the picture she was concerned that if I saw hers that I would not talk to her anymore, because she is a lot larger than I am, and did not want to get rejected by someone else like she had several times before in chat after they saw her picture.
So sometimes there may be something more to it than just someone blowing people off, there may be more.
Oh, and her and I continued talking, I told her seeing her picture was not important to me, because I already liked who she was, seeing her would not make that more so or any less. We continued talking again for about a month and she sent it to me. And afterward we still talked. Up until she left the forum for her own reasons, but on occasion when she checks in on stuff she will send me a quick PM. She is married now and happy, and I am happy for her.
Rob