I have been away from the boards for a while... in reviewing posts I had to respond to this one.
I had a HAS test (High Altitude Study) done before going on vacation to Yosemite (alt 4,000 - 7,000)
It showed that at 5,000 + I would need o2. (My normal sats are 90-95 and my FEV1 is about 40%). Except for the first day adjusting to the altitude, I wound up not having any trouble what so ever. (I live at alt 2,300)
Ask for this study to be done, so if she normally isn't on o2, at least they could rx it for her, if needed.
...tell her to have fun in Europe!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!