Folding Electric Treadmill (Bromley, BR1)

My wife has suffered a number of falls recently and really could do with something to exercise her legs, but in a safe environment. A small machine, nothing too complex, would be ideal if someone has a treadmill that they do not use. Space is somewhat limited for such a machine and I need to be able to get it in and out of a hatchback size car for transportation. If it comes apart, reassembly should not be a problem for me. Any suggestions will be greatly appreciated.