Newbie - FAQ
I wasn't there so I can't say for sure, but it all depends on whether you were being really aggressive or rough, or if she was just having an off day, or if she was indeed being shady and trying to finish you off quickly and rush you out.
We ladies can get sore down there. If I am with a guy and am getting sore or over-stimulated, I may well take a break to do some hand action, oral, kissing, etc. and there is nothing wrong with this. However, I think communication is important for both parties.
If you were hurting her during the act, she should have spoken up and asked you to "take it easy," like you said. However, it may not have been anything you were doing wrong; she may have just been sore. Our natural lubrication, tenderness, etc. varies greatly based on time of month, hormones, amount/type of sexual activity, etc. My impression is that she wasn't trying to rip you off, she was just listening to her body. However, if she tried to rush you out the door before your time was up, or rushed you to your climax, then I agree that she behaved unprofessionally.
Sorry your first experience wasn't exceptional- if she was a well-reviewed lady, she was likely just having an off-day, but if not, I'd strongly urge you to book your next session with someone who is known and reviewed to maximize your chances of getting the best experience possible. Just my .02 ~ best of luck to you and happy hobbying 
XoXo,
Marea
Marea speaks a lot of sense above.
It's a pity your first encounter was disappointing to you and none of us can say why they lady behaved the way she did. I don't know if you were being too rough/enthusiastic but providers are only human and can't necessarily take a hard pounding any more than any other woman.
I hope you're next experience is more fun 