Well it may depend on machine they use, had 3 scans last year all on kidney area and 2 of them was enclosed and other one head was out.
They shud give her headfones with music and she can ask for a "rochey" valium 5mg shud be fine.
The procedure is fine just bit loud at times with the magnets banging away but better to just get it out of the way.
On all 3 occasions I went in headfirst and I wasnt clausto. Best of Luck