Can she still prosecute?

Back in 2006 my mom did a investment on a few properties with a builder down in ATL and we are in OH...She took out a home equity loan of $100,000 and he agreed to pay the mortgage while the investment was in progress...There is a signed contract that she has in hand...Not only did he not follow his commitment but made money off of the investment and never returned her portion...She almost went into foreclosure and has had to downsize since then..It has caused her a lot of grief...Any advice would be great