I think direct, clear and tactful is the the way to go. You make it about yourself, not about her.
(hmm, now how to say it?)
I'd just say you are in training and you need to ride at "X" pace, and while you appreciate the company, it's not working for your training program. You can always add that "your coach " or "your program" has set these guidelines. They don't have to know that you are your own coach, or that you make the guidelines. You''d be happy to join them for a recovery ride sometime.
The thing is, if they get bent out of shape (bad pun, sorry) about it, are they worth having as friends?
Last edited by Irulan; 10-10-2012 at 10:19 AM.
2015 Liv Intrigue 2
Pro Mongoose Titanium Singlespeed
2012 Trek Madone 4.6 Compact SRAM