Don't be frightened of changing instructors, I went through 5 before passing!
Four of them were bloody awful, one was racist, told me to be careful near a zebra crossing but I'd get extra points for knocking over any 'darkies.'
One was really letchy and didn't want to be within 300 meters of him let alone in an enclosed space.
One was really unreliable and would cancel at a moments notice then just disappeared over night.
One was just useless, not sure how he could be called an instructor.
This was in London ,it was hot topic between friends who were trying to find a good instructor, I wasn't the only person I knew who had issues. Maybe they wouldn't have been able to get away with such awful behaviour in a small town , who knows?!
Then I gave up for a bit and started again when I moved out of London and my final instructor was absolutely brilliant and I passed quickly. The difference between the ones I'd had previously was like night and day, he was patient and professional.
Don't be afraid of changing instructors OP, you asked for a female originally,don't get fobbed off with someone you're not happy with. My instructor never did 2 hr lessons to start with as you can't drive that long as a beginner so just end up doing theory in the car and that's a waste of money as you can do that at home. Iirc I only had 1.5 hr lessons just before my test.
Good luck.