Hi,
I hope your mother is doing well. It is very scary!!! I am 44 and was diagnosed with cancer in my ethmoid cavity (behind the nose). I underwent radiation for 35 days and 7 doses of chemo. It was tough, but with so much going on in your mind, time really goes by pretty fast.
They have come so far in the treatments nowadays that you can get through this. I think the hardest part, looking back at the whole ordeal, was being diagnosed and dealing with the shock and the fear of "Oh, no. What am I going to do?"
Just keep your head up and have faith in your caregivers. Make sure they are good and just do what you're told. The rest will work itself out.
Good luck