Kunilingus, I am not a particularly go-get-em girl myself, but kegels can be done with no effort at all; really, it's just a matter of remembering to do them until they become a habit (I sometimes find myself doing them on the train without realizing I had started).
You may do better to find an easy how-to guide for her (so she knows she's doing them right) or have her talk to her doctor. Also, point out to her that they will increase the strength of her own orgasms--she has my word on that.
The only reason I'm not so gung-ho about your pepper trick (well, second reason is that I can't imagine enjoying having pepper shoved in my face when I have sex), is that the kegels don't just make sex better, they will reduce her chances of incontinence when she gets older.
Which is just not sexy.