Yep - some regulars start to take the piss and see you as easy money - no doubt in my mind
Flying Blue has perfectly explained the issue in one sentence.
If you keep seeing the same girl, and are lacking in confidence and are nice. You get seen as a softtouch and a pushover and the level of service drops off a cliff.
I have called it third punt phenomena as this is how many times it usually takes for it to happen to me.
No matter how many times you keep booking her, you are not going to get it back to how it was. Its only the unprofessional girls who will do this, and thus, you are not going to get it back.
So you have a choice, keep seeing her knowing the punts are going to be a fraction of what you'd get with someone else. Or just book someone else.
There are some bloody amazing girls in the north east. So whoever this girl is, she is not alone in the NE to think to yourself that you have to put up with it.