Glioblastoma

Hi,
My mother is 66 years old was just diagnosed with Glioblastoma. We have an appointment this coming Wednesday to set her up for Radiation therapy. We are afraid and tyring to make the best decisions concerning treatment. The Radiation Oncologist said that we should consider the quality of life right now, when deciding on treatment, becuase there is not a possibility of a cure. If there is very little chance of survival (according to man), should we spend what time we have going throguth treatments that will make that time miserable?

I would love to get some feedback from you based on your experiences.