Play hard to get and give her reasons to feel jealous. That's what works for me. As I always say, cats are like men.
Also, progress with cats is never gradual, it's always in leaps and bounds. And it's always darkest before dawn - meaning when you are totally sure that there's no progress with a cat anymore, bam! they surprise you with a leap forward.
Cats are (like humans) highly influenced by the behavior of other cats (cats are copy-cats). Seeing you pet other cats makes them both jealous and more trusting of you, and they want to try what the other is getting.
Cats are not stupid and they know when you're after them to pet them / give them attention. Then they're very picky about how, when, how much, where, etc. If you just don't for some time, they'll soon come begging and will be a lot more flexible and trusting.
This is all from my experience with my strays and former stray.
The Royal von Meouw Dynasty: His Royal Highness the late Prince von Meouw,
Her Royal Highness Princess Gatita von Meouw, Nikita Duchess of Meouw and
His Highness Cuchi-Cuchi, next in line for the throne of Prince von Meouw.