And I guess I will respond!
Actually we have been contacted by many people looking for employment, and some have been employees of offices we have been in contact with. It can get awkward, but sense you are not working for the provider she is employed by, it really isn't an issue. I would just respond saying that at this time you do not have any positions available, however, you will keep her information on file.
You could actually use this for your advantage. Let her know that you if you gained more clients you may have some positions open up. That may inspire her to get you in to see her boss! You never know.
Good luck
Michele