Daughter Had Tonsil Cancer

My daughter, age 40, was diagnosed with cancer of the tonsil. She had them both removed, they also did a neck disection. She is now going into phase 2 with radiation coming in a couple more weeks. This week she will go in and they will make the radiation mask. She is petrified, since she is clostraphobic. Can anyone give me some words of advice to comfort her? She isn't married and is going through this with family love and support. Her surgery was 4 weeks ago and she is still having trouble swallowing meats. Has anyone else been in this situation and can you tell me how long this will go on? She has lost 20# and needs to gain before the radiation treatments. Her right ear and side of the neck is still numb from the surgery. Any supportive words will help. A caring mother