Mears taxi. Assembled, you need to request a taxi van. It comes with a ramp that folds out of the rear doors, she can ride right in, be sure the driver ties it down.
Or rent one that can be disassembled, and use a regular taxi or a rideshatlre. Be ready, willin, able to stow the pieces yourself, although drkvers tend to be really helpful.
Or Mears shuttle, arrange at least a day early, be sure to let them know about the
ECV.
Or leave that one in your room, use any transport, and rent one at Universal.