There's a lot of these B2B/'DIY' girls out there...a dime a dozen IMO...
Maybe she retired..on vacation..pregnant..back in school..does not want to see you..gets too many e-mails..her scheduler quit..
Just send her another e-mail and if she does not respond soon, move on to the next girl.
Nothing special worth waiting for about her anyways.

Im sure if their scheduler is not responding it is due to her not being around.  If she is around and you havent pissed her off or something they would schedule you.  They are there to make $$