She should have discussed it with you, raised a fee note and asked you to discharge that fee note before taking the fees.
Mind you, if you are at the tail end of a contested Divorce, and there are still many outstanding issues not settled, it will have cost quite a bit in fees and I know, if I was in her shoes, I'd be looking for more funds.
You should take it up with her and , if you are unhappy, report her to the Law Society. They are very keen that client's funds are properly dealt with and that Section 68 letters ( the how much is this going to cost you letter) are issued.
mf