Just got the boss lady on a Terratrike Rover today.
TerraTrike She liked it overall but we have some issues we must resolve. Very wide hips overlap the seat frame so checking into additional padding. Also have to make sure it will fit into basement storage in our RV after some disassembling.
She can ride a 2 wheeler but due to a brain injury I feel more at ease with her having a stable platform should vertigo strike or some other event.