What would you like to know about this please?
Have you been paid the value of the work you have done hitherto?
Well, you can't return if they won't let you. You cannot force your attentions upon them. If they are refusing you access then there is nothing you can do about that.
You are entitled to be paid for the work you have done.
She can defend on the basis that it is substandard and the matter can be resolved in court. If it is not substandard then she will have to pay.
If she refuses to pay though then your only option is to sue. There are no other remedies.
But yes, if she refuses to let you complete then that isn't your fault.
Obviously you will not have a claim for the full amount of the contract but you would have a claim for the value of hte work you have done.
Can I clarify anything for you?
You are under a duty to check to see if the work needs remedy and do it if it does.
You could try to argue that she was abusive so you shouldn't have to but it never goes down very well. In keeping with the modern reverse sexism, in my experience, men are just expected to put up with things like that whereas woman do generally play the victim better and get away with more.