Sorry to hear about the split. Unfortunately if she wants her name off the loan you are going to have to basically refinance using only your name and income. Lenders will not let you just remove a person from the loan because they lent you the money based on both people's income and credit. Hopefully you didn't buy (or refinance) in the last couple of years and have some equity. With the recent decline in market there have been a lot of incidences where people don't have the option of refinancing due to loan to value ratios.
If you would like to contact me regarding this or any other issue I would be happy to answer any other questions... By the way, I am also a Loan Originator so I may be able to help.