I have been in the Swiss Alps, highest mountain we got up was the Titlis. I got a headache instantly and we went down again fast, with the next elevator that came i think. Though i know i didn't mind the headache cause it was great to be up there! The last lift went as high as 3300 meter i think! And the view was brilliant.
I don't know what my pft's and sats were. It was a long time ago when i was about 6 or 7 or something. Though i think my pft's and sats weren't that high..
I would really recomment your daughter to go there if she can.