Holy crap... what a difference 10 min in distance can make! That's almost twice what I charge on a monthly basis!! But if the market will uphold it; more power to ya! (Sort of makes me wonder if I can look at raising my rates a little more though, LoL)
I would say that since you are just implementing the new rates.... go with your gut on this one. I think you can tell if she is genuinely concerned about paying two sets of fees or if she is going to be a nickel-and-dimer.