Something very good for lung infections is inhaling eucalyptus oil. It needs to be 100%. Some eucalyptus oil for sale is diluted, and not very effective.
She could wrap a towel around her neck, and put a little eucalyptus oil on the front, just under her nose, so she inhales it all of the time.
If you can't get eucalyptus oil, she could inhale oregano oil.
There are other beneficial things. Examples include: