M.M.
I would elevated the crib mattress and continue with the humidifier. You can get the bathroom all steamy from a hot shower running, then fill her a bath with johnson's vapor baby bath stuff and let her sit in the steamy room filled with vapor smell for a while. That always works good for us. Also...this sounds nuts but it works...put some baby vicks on the bottom of her feet rub it in and then cover with thick cotton socks. This works wonders for a cough. I have done that several times (even with croup) and it always works. You can also rub the vicks on her chest and/or back to help with the congestion. Make sure she gets plenty of fluids as well.
Hope you all feel better!