I'm not into roller coasters, but I hear that EE can be a tight fit if you're overweight. They have a test seat so your friend can make sure they fit before getting to the front of the line and being embarassed. Tell her to relax and go have a good time! She should be fine!!
No problem with EE-
Early-on, when EE premiered, There was much discussion about larger-sized adults "fitting" into Expedition Everest seats.
Back in late January of 2006, EE previewed to the public for the first time (limited to AP holders and DVC guests).
At that time, the lap-bar restraints had only "one click" to lock into position, and that one position was very low and VERY SNUG into the lap.
Many Pooh-sizers had trouble getting the bar to lock into position and some had to try to lock the bar first, then attempt to "slither" down into the seat with that bar pressing hard into their mid-sections.
I was THERE at that time (late Jan. '06), rode EE several times, and personally witnessed how the lap-bars worked and how the guests had to maneuver themselves to fit in the cars.
Since that preview there have been lots of questions as to whether Disney had made further adjustments to the restraint system.
But nobody seemed to be able to say FOR SURE that there had actually been any physical changes made.
WELL, GOOD NEWS:
After a May, 2006 visit to WDW, I can say without question that:
YES, they DID change the restraint system!
There are now MANY lock-position "clicks" on that lap-bar and it can be considered LOCKED at a much "wider and roomier" position than the first timers experienced.
So, EE is now VERY FRIENDLY to Pooh-sized guests... even quite large and tall.
I wanted everyone to know that from someone who experienced the "before" and "after" of the EE restraints.
This means EE joins the other major attractions at WDW that are accommodating to adults of virtually any size!