2010 Jeep Patriot suspension problems

My sister was driving my vehicle. She felt car wheels pulling to one side. Vehicle began to veer out of control where she tried to stablize. Picture taken after accident shows that bottom frame of vehicle became unattached from vehicle. The vehicle did not hit another vehicle or anything else solid. The vehicle was in motion on two way street where the vehicle was keeping straight with no turns.

When braking, the jeep seems to loose rear control features. The same often occurs when slowly accelerating. It has "shifted" from one side to the other at times when general straight road driving occurs. Speeds have never exceeded 30 MPH. Braking loss of rear control occurs at speeds never exceeding 5 miles an hour