DME buses cannot kneel, so she would have to use a lift.
She will NOT want to stand on the lift, even if they allow it. the lift for the DME buses go about 6-7 feet in the air.
When I got there, they told me they have a wheelchair they could put me in, since they did not think my wheelchair would fit (it did with ease, btw), to get me on the bus.
The buses ride higher due to the storage under it.