Partner and I split up in October 2013. I pay the full mortgage. Not married. Can I charge her rent?

I moved out on October 2013. I paid the bills until October 2014. I currently pay the full mortgage. I have asked for half the mortgage to be paid and back dated which is refused.
I asked her to put the house on the market but it s still not. My ISA that I paid into will be used for repayment of mortgage. Going through solicitors but she is time wasting constantly.
No kids. She is in effect living rent free but now paying bills.

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