Unfortunatley from my experience with my three, there isn’t very much you can do. Benadryl at bedtime is sometimes helpful. A little Mentholatum rubbed on the chest and a little under the nose helps some. (Mentholatum is similar to Vicks but much milder. You can put it on your lips if they are chapped; that’s how gentle it is). The saline drops can be helpful, but nothing that I know of really zaps it out of them. Lots of fluids and rest.
Basically all you can do is let it run it’s course.
I hope she’s feeling better soon.