There is a hemi-walker as listed above and a quad cane(a cane with 4 little supports) with each you have to lift it, they don't roll like a walker. The hemi-walker is more stable but bulkier to lift, the quad cane is easier to lift.The other walker mentioned in a platform walker but your mom couldn't put pressure on the injured side, and it might be unstable because of that.

Take care, diana