J.D.
Nurse her for as long as she needs to... Why not? Sounds like she needs it. She was just sick no? Kids nurse more when they are sick for good reason. Keep her in the bed with you and nurse her as much as possible, and thank your lucky stars she has your breastmilk to make her better. I try to nurse my kids as much as possible when they are sick.
Also I think Liz D is right and she is probably extremely hungry after losing 2 pounds! That is a lot for a little baby. This is probably the worst time for you to be limiting feedings. I am sure that is the main reason she is nursing so much right now.