Has she already had her 6wk check-up?
Normally at 6wks both of you would go to the Drs and just have a bit of a check-up, have you had that yet?
Poor little thing, i would suggest to make sure you have LOTS of water, maybe some orange juice, try and rest so you don't get run down, keep her all warm and rugged up.
I'm not sure if there is an issue with using a vapouriser in their rooms at this age but thats a good idea if she's got a bit of a blocked nose, they work wonders! Just check it's ok for her age.