
Just agreeing with the others. All states recognize the handicapped placards from other states. The only one that didn't was the District of Columbia, which required their own permit. I just read a few weeks ago that they changed and will now recognize the placards from other states.
One thing to keep in mind though is that the handicapped parking areas are quite large and if the lot is fairly full, you will have a long walk. That's not a problem if she has a wheelchair or
ECV, but might be a problem if she doesn't.
There are some wheelchairs available in the handicapped parking area that can be used to get from the parking area to the place where you can rent wheelchairs/
ECVs in the parks. When we were at WDW in March and just recently early this month, we noticed the corrale for holding the wheelchairs was often empty. So, you can't count on one being there when you need it.
The regular parking lots have trams that go from the parking area to the entrance of the park (there are no trams for the handicapped lots). If she can step up to get on the parking tram, she will actually have a shorter walk by parking in the regular lot and riding the tram. The CMs do save spots near the tram stops for people with mobility problems.
If you are staying at one of the WDW resorts, I'd suggest using the buses to go to MK. The buses deliver you close to the park entrance. If you drive, you need to walk or take the tram to the Ticket and Transportation Center. From there, you have to walk a bit to the boats or walk a shorter distance (but up a steep ramp) to the monorail.