Yes wheelchairs are available.
There's a pull up on the west side entrance. If you go let them know they'll bring a wheelchair.
You can drive up to where you can have a wheelchair available for you with assistance if needed
They do have wheelchairs for these situations. I'm not sure if they have a pathway for cars near an entry but someone can get a wheelchair for her. But call first to double check.
There is a smaller place to pull off of Washington Blvd for the east entrance, you can't park there, but you can drop people off. Your best bet is to pull up along the south side, from there, one can access both the east and west entrances.
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