Is this girl a risk?

She sounds like a flake to me. It is hard to take someone to a company party because they usually won't know anyone. It is important to try and stay around so they don't feel to uncomfortable. Second if the guy is married and she still lets him flirt enough to get you pissed off enough to want to kick his a$$ then she seems to enjoy the attention and it may end up with her cheating. I of course can't say this for certain but it does seem like a high possibility to me. Sorry, good luck.

I agree with Tonsel1983...if she really liked you she would pay attention to you. But it sounds more like to me that you don't trust her. And when there is no trust in a relationship, there is no relationship. It will end badly without trust....believe me I've been down that road a couple of times........So do what you think is right.

My opinion is if she really likes you she should be paying attention to you, all the time. You really need to talk to her and explain that it's not cool. Next party she does that, it's time to look for someone else.

Sounds like it, particularly if she was making excuses for his poor behavior. My guess is that you're the kind of guy that she wants to be with and that, unfortunately, she isn't ready for. To wit, that she pretends in her head that she's looking for someone good, but maybe she feels like a loser inside and so she's more comfortable with losers? Which is why she doesn't mind being hit on, even in an offensive manner.

I'd say cut your losses short before you lose anything more. You can start off with telling her how uncomfortable you feel when she drinks or flirts with other guys and start giving it a bit of a distance and see how she reacts. If she changes for the better, than it is a good sign, but if nothing happens, it could be a good lesson learned not to value someone who doesn't deserve it, when it is still too early.