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You might was to do some research/reading on current thoughts of DCIS. Go to nih.gov and to Dr. Love's breast cancer site for further reading. Dr. Love is considered one of the top experts in breast cancer.
I just want to add that a mastectomy does NOT prevent bc from developing or returning. It is technically impossible to remove all breast tissue so some breast cells are left behind. Also surgery could cause a few cell to be picked up by the lymph or blood system and carried to other places in the body.
If this was me I would be getting a second opinion from a breast surgeon and an oncologist who frequently treats breast cancer. A good place to get an opinion on this is a teaching hospital or a large facility that does research. These guys are up on all the later research in the field.
What ever you do you have time to gather more info, learn about this condition, and make an educated informed choice.
take GOoD care