Pixie my sweet....... Whatever you decide, if you go and YOU feel uncomfortable at any stage you pull her out and walk away. If it looks seedy it probably is. If it's clean and professional looking it might be okay but unless you are 100% happy at all times....walk away.
I did a few glamour shoots a few years ago and whatever else was going on both me and the model had simple caveats, if either of us felt uncomfortable they could walk away, I did once and a model did another, she just couldn't do what she wanted to do. I always had someone with me as well.... If nothing else ensure you have that option.