Well, from her website, it appears she mostly reps NF stuff, like self-help and the like. I found the "Testimonials" page a little odd. I suppose some of them are her clients, but it seems strange to include some of the other comments. I was expecting something more along the lines of:
Milton Kahn Associates
Raab Associates
Generally a publicist is extremely proud of their clients and tout them loud and long on their website. The ones on Jennings's site seems a bit . . .
low-key. It might be that's her style. But you might also want to take a look at
this list to see if someone else might suit you better, since you found one negative already. Naturally, you'll have to vet the other ones too, so check out the clients to see who they rep that is similar to your book.