My husband and I purchased a home with my mother-in law 6 years ago. It has

My husband and I purchased a home with my mother-in law 6 years ago. It has been 2 years since she up and moved out and decided upon herself to not pay. She is on the deed and mortgage. She refuses to do a loan medication. refinance etc. So we have struggled to pay. She finally decided to agree to a short sale. We all signed the contracts. Since then she won't return any calls from the realtor. We are at a stand still waiting for her to provide her with some paper work. In the mean time we are going to end uploading our home. I have two small kids. Is there anything we can do?