Really, I would suggest almost any of the attractions you'd take any 6 year old to. Obviously there will be some things that are harder for her to follow without the visuals, but she should still be able to enjoy most of what Disney has to offer, even if she needs a bit of a running commentary from time to time.
A few I can think of off the top of my head are:
Country Bear Jamboree - good music, good fun
Goofy's Barnstormer - gentle rollercoaster ride, aimed at kids
It's a Small World - though she may not be able to see the individual dolls, there's lots of colour, music and movement for her to enjoy
Great Movie Ride - though it might not seem an obvious choice, the story is well narrated, so she could follow what's going on
The Pixar Block Party parade in DHS - If this is the same as the DLR one, then it parks up, plays music and gets everyone dancing. Get her up front if possible, and she can dance with the other kids and the Pixar characters
Character Meet and Greets - they are all wonderful with kids with disabilities, and she'll be able to hug and talk to her favourite characters
Water parks - the creeks, family raft rides, wave-pools and kiddie playgrounds could all be enjoyed by her
Fireworks, light parades etc - this depends on how good her sight is by the time they go, but it will give her bright lights, lots of colours and good contrast to follow. Also, the narrations and music are lovely on all of these.
Shows like Bug's Life / Philharmagic / Star Tours - though she wouldn't be able to see all the visual effects, these shows have other sense-inputs too, especially Star Tours!
BBBT - if she's a girly girl, a princess makeover might be fun, to give her a little special treatment. She may not see herself, but she can feel her hair and (if they go for the whole thing) dress, and every little princess enjoys being the centre of attention for a while
They might want to avoid some of the darker rides, such as Dinosaur, as they could be hard for her to follow (and Dinosaur might be a bit too scary for a 6 year old anyway). Swiss Family Robinson Tree-House might not be great for her, as it's a lot of walking up and down steps, for a fairly visual attraction.
Basically, I think the best thing to do would be to have them read the descriptions of each attraction, talk them through what it involves, and see what they think she would enjoy - just as you would with any kid!
Also, reccomend that they spend time just enjoying Disney itself - eat Mickey bars, stroke the cuddly toys in the stores, listen to the background music, inhale deeply whilst walking past the bakery on Main Street (or better still, don't walk
past - walk
in!), play in the water fountains (make sure they have a change of clothes for her, as you don't dry quickly in the humidity), and all the other little things that we all dream about when we're not at WDW
They might want to look into getting a Guest Assistance Card (GAC) to allow them to use a stroller as a wheelchair. This would mean they could take the stroller into lines, to help her negotiate the queues. Though some lines she'd probably be fine in, she may have trouble in lines that are very dark, crowded or have tight turns. They wouldn't need to take the stroller into every line, if they didn't want to; only the ones she might need some help on. A GAC might also be able to help them avoid moving walkways, if this will be an issue for her. For more info on the GAC, see the disABILITIES FAQ.
DON'T try to do commando tourism! This is really hard with any small children, especially on your first trip, but it would be even harder on her as she might need to be given a little more time to enjoy things properly.
OK, I've rambled through most of my lunch-break, so I'll leave it there for now. Wish your friends a wonderful holiday from us, and I'm sure they'll have a whale of a time!
)
) Apparently when I was little, I always used to dance along, and whenever you go in there, there's a row of kids dancing up front.
) - lots of music, bright colours and everybody dancing!
