I'd go with a Scrambler too, my wife is 5'-4" and very wimpy, but she has no problems riding mine, in fact she enjoys it very much.

 

I just bought 2 new 2005 . The Sportsman 500 and the Scrambler 500. All I can say is WOW. Both are a graetride but the Sportsman is a cadillac.
Gas guage sucks on the scrambler but I think I can find a aftermarket one.

Rick

 

Get her the one you really want yourself, and hand her the keys to the one you have already!