Getting onto the plane:
Airports have smaller wheelchairs that fit in the narrow airplane aisle, so she will need to transfer from her normal wheelchair to the airplane one. Make sure that when you make your plane reservations, you list your mom as disabled & will need wheelchair assistance down the aisle of the aircraft. And, of course, allow for extra time at the airport due to this.
Scooter rental:
A lot of DISers have rented successfully from Deckert in Anaheim. From what I’ve read, they deliver to your hotel & will pick it up at your hotel at the end of the rental period. Overall cost is a bit less than renting by the day from DL itself. Plus, you get the convenience of being able to use it from your hotel to the park, instead of having to use the wheelchair to get to DL, rent the DL scooter, stash the wheelchair somewhere, etc., etc.
When to go:
Since chances are this might be her last trip to DL and she’s always wanted to see it at Christmas time, go the week
after Thanksgiving. According to
http://www.usclimatedata.com/climate/anaheim/california/united-states/usca0027, average rainfall in Anaheim in December is 2.01 inches and 1.38 inches in November. Keep in mind that this is an average. So maybe go earlier in December rather than later. If absolutely no rain is a must, then you should probably eliminate Nov-March altogether. Summer months you are least likely to get rain, but it is much hotter at that time of year and higher crowds.
Where to stay:
I'd suggest that you peruse hotel reviews on Yelp, especially the hotels on Harbor Blvd. Unlike Trip Advisor, businesses cannot pay Yelp to get better reviews. Absolutely closest one is Best Western Park Place Inn. Tropicana Inn & Camelot Inn's have a special going on in 2015 whereby you can get a certain % off your room rate if you stay at least 5 nights. If you are a
AAA member, you can often get AAA discount at various hotels. Hojo's has a 15% off the room rate code off of the Mousesavers website (discount code = LKMS).
Use Disney travel or not?
You will likely not be able to get better deals by using Disney Travel. In fact, the opposite is likely true. You can get better room rates by looking yourself. I've gotten decent deals by doing it myself and I don't even use Expedia or Orbitz.
Misc. comments re: plane travel:
Given how disabled your mom is, something to consider when you are trying to decide which airline to book with is how does your mom handle drastic last minute changes these days after her stroke? For example, let's say you get a really great flight deal on Company X, but it's on time departure/arrival #s for your route are pretty lousy (50%, let's say). How would she cope with having to sit around an airport for several hours waiting for a later flight? Or if Company Y has a much better on time departure/arrival #s but is a little bit more expensive, maybe go with that one. Also consider how often you'd have to change planes, whether to fly into LAX or John Wayne/Orange County Airport, etc.