M.B.
It should bounce back... let her nurse as often as she wants, and resist the urge to give her any supplemental feeds.... her nursing frequency will help rebuild your milk supply.
When I was 6 weeks pp, I ended up with a really nasty strep bug, and then an outbreak of sores in my mouth... it was very hard to eat or drink anything for a week or so. I lost 11 lbs in 3 weeks. My supply did come back with the frequent nursing.
Be sure to drink plenty of fluids as you are doing, and eat healthy.