That might help
loosen up some of the congestion
. Also do the humidifier with the vapor menthol stuff in her room
. Just don't let it get too fumey.
Keep her nose cleared out as best you can, which is almost impossible with a 6 month old, and just try to comfort her. she may gag and cough up some major goo, just help
her clear it out with a wet wash cloth. give her some water to help
wash out her mouth, too. milk makes it gooeyer, which is unfortunate.