[Solumina]

I've done a good amount of pet sitting where I didn't actually know the pet before hand (just the owners) and I can tell you that more or less ignoring the cat is the best way to get her interested in you. Just don't show any interest in her until she shows interest in you and whenever she does come up to you have some sort of treat in your pocket (little bits of chicken have always worked well for me) that you can give out right away (but don't try and get her to eat it if she doesn't want to, just go back to whatever you were doing. Once she knows that going to you will lead to something good for her you can replace the treats with something more interactive like a bit of string.