Have you tried turning the tap on when she's sitting on her potty?
Often the running water will stimulate some action...

Yasin wasn't keen on the potty and it wasn't until I bit the bullet and put him in undies and resigned myself to cleaning up messes that we had any progress. The first day he peed on the floor every time and each time he peed I just took him to the potty and asked him to sit on it even though it was too late to build the connection. In the afternoon I saw that action was imminent so I plonked him on the potty in time then rang his Dad and praised him and so on. Since then he's being going great.
I just praise the success and ignore the misses and he seldom has an accident now.
I still haven't braved the outside without a nappy on him. That's the next frontier.