You can go to court to force the sale - if there are no children to consider then the court will order the house be sold, unless she buys you out, which it seems she can't afford to do.
All this is aggravation and unnecessary cost - but if that is the only way then at least the option is avaiable.
In the meantime, make sure you have documented proof of your payments towards mortgage, bills, property maintenance - everything. Do not move out unless you absolutely have to. She could equally move out, don't forget. You are entitled to live there just as much as she is.