I personally would just keep doing the potty every night before bath, but don't push it any further at this stage. Once she is weeing before her bath, you can always try some nappy free time outside and encourage her to use the potty.
I would do this as well. I started with the bath time potty with each of my children. 2 were day trained by 21 months, the other one never went at bath time but at 21 months demanded the potty to do poo and never wore a nappy again.