I agree with the other mom and recommend you get the baby to a pediatrician. It's important to get the mucus out before it settles and creates a bacterial infection in her sinusus or chest(Note: I have no medical training so simply speaking as a mom). Two days is a long time for a little person so I recommend you reach out to a doctor sooner than later.
In the interim, just give water - no juice or dairy (milk) products. Saline solution (purchsased from your local pharmacy) and a suction bulb will help get it out her nose. Little noses is good but ensure you DON'T use any type of cough suppressant. You want her to get the phlegm out. I typically take my guys into a steamy bathroom by running hot water in the shower to steam the room up. It helps moisten and break it up so they can cough or sneeze it out. Don't stay in the bathroom more than 3-5 mins and keep her covered with a sheet except her face. This limits the opening of her pores so she's not so exposed when you come out into the regular temperature of the house.
Also, mucenex is the best but check with your pediatrician as giving over-the-counter meds is a highly controversal topic relative to their actual effectiveness in small children.
Good luck and absoultely let us know when she gets better. -A.