She may not have any info. online. It could have been in the past. Perhaps she hadn't pursued it for awhile. However, after losing her job at the dentist office, she may have been more susceptible to a con man, saying he could revive her career.
I'm not saying that it isn't also a possibility that she was delving into the seamier side. It's just that some people are so ready to slap that label on her. I can understand their viewpoint. I mean look at the Long Island callgirl investigation. I'm sure some of those women had other ambitions before slipping into that business because they needed money.
If she had done modeling before she would be aware of the potential dangers as well as the physical requirements, I doubt anyone would be able to con her that way.
Other than speculation here there is nothing to suggest that she was doing modeling anyway. The more reasonable conclusion is that she went there with him because she had some sort of relationship and she wanted to. the question is what sort of relationship was it? And did she really get swept out to sea like he says? That sort of thing does happen all the time, so you can't assume "oh, she is missing, so he must have killed her".