Resharpen burs...who's she kidding...sounds like a line to me...you must have turned down something she wanted to do to you so she could afford a new car or trip to some exotic location.
Consider they range in price from $3 to $30, resharpening them just is an excuse, the dentist I know all toss them when they begin to show signs of wear.
I did order a specific type from one of them not too long ago. I got a five pack of bits for about $30.00
Nope you must of pissed her off!
Check this link.