This may work:
-At least one available restroom must be fully accessible with a sign located to the side of the door, 60 inches to centerline.
-Restroom doorways must be at least 32 inches wide for clear passage with the interior having a 36-inch wide path to all fixtures.
-Restroom doors must be easily opened without more than a 5-pound force and have accessible handles that are 48 inches high or less.
-Accessible restroom stall handles—lever or loop handles—must be installed so the door is able to be used with a closed fist.
-Accessible stalls must have at least a 5-foot by 5-foot area for a wheelchair to maneuver within.
-Grab bars must be both behind and on the side wall nearest to the toilet with a toilet seat that is 17 to 19 inches high.
Or this:
http://www.bobrick.com/Documents/PlanningGuide.pdf
Some localities may have additional standards.
Consult an attorney licensed in that jurisdiction with ADA experience.
A state or municipality or county may have their own accessibility laws provided they are equal or more stringent than the federal ADA. For instance Florida accessibility code requires that the handicap accessible bathroom stall have a sink. This is more stringent than federal law.
For handicap bathroom she also needs to be concerned with sink height. Distance from the wall to the center line of the toilet. The controls for the sink. The maneuvering space under the sink as well as making sure the pipes are wrapped. The height and angle of the mirrors. There are some variations permitted if this is an alteration.
I didn’t find the rule that says toilet paper depensers must be at the level of the toilet seat. THAT is the practice that irritates me: contractor who can’t be reasonable in the regular stalls.