now i'm no mechanic but i do know that the mustang cruise is universal enough to also go into a 1987 f150. aslong as the buttons go i know the 95's and the and the year you have do have pretty much the same stearing wheel.
Yeah, there's no reason the electronics should be any different. You probably even have most of the wiring needed, since I doubt Ford would bother having different harnesses for cruise and non-cruise models. They probably just have nothing plugged into the cruise wiring.
Shouldn't really be any. Just make sure she gets all the harness connectors that should be attached to all the CC pieces. She may need to use the steering wheel that it's attached to...not sure if the non-CC wheel has mount points for CC buttons.