I don't have good luck with models.

[Peter Jochems]

Hi Jeff,

Maybe you could try to ask the talkative model to pose for you. If you explain what you want she might be more suitable for your purposes and willing to do that than the silent one. That she is talking more might signal that she is more into it than the other one perhaps. Just explain what your problem is.

Isn't $100 a lot of money? At a local artcenter here in the neighbourhood they offer nude models 30 euros (about $40) to pose for 2,5 hours. While that's not much, $100 is too much I think.
The problem with paying models quite a bit of money is that they come posing for you even if they shouldn't while they're too tired or sick. You end up paying too much and having too little in return in appropriate drawing time.