It's the stairstep principle in action. You start with a 5, if you have to, then move up to a 6, then a 7, and so on. Just don't start with a 5 and move to another 5 or a 4 or something like that. You move up, not across or down. You use that principle in venues, or the way you're talking about right now.
Beware though, if you're any good sexually, not only will she spread the word to her friends, but she will also not want to leave you alone.
I myself have a 5(on a good day) that has become a regular at my club. I haven't given her sex, and won't, because I have other options. However, she was a part of a 3 set (the other two were much more attractive, one was about a 7 and the other a

that I got involved with when I first started going to this club. Me and the 8 hit it off, pretty much right away, but the 8 and 7 don't live around here. However, the 5 does. So, she goes there a lot now and the other night I was using the stairstep principle, since she automatically jumps at me when she sees me. Well, I had 7's and 8's start throwing me IOI's, which was the purpose, of course. The problem was, the 5 wouldn't leave me alone. I couldn't shake her, lol. So, the next night, I went in with a 9, the 5 was there again, and STILL tried to blow the 9 away from me. It didn't work, but she tried, lol.
So, there are two sides to your situation. You can use the stairstep principle, just make sure you do what you can to keep from her getting to possessive of you.