Another vote for tire swap/pressure change... I know I can squeeze 40 mm tires onto my 7.3 FX, and a set of 40s with the lowest pressure usable for her weight would do more to smooth road buzz than any cheap fork. The only remaining hurdle would be to overcome the mental perception that a front suspension is needed for a comfy ride. Especially if you spring for a nice set of supple wide tires.
Also, I love the Ergon grips someone else mentioned.
To add another element to consider, based on women my age (late 50's), they really like to have light bikes in case they need to lift them... suspension adds weight.
