Hodgkins & non Hodgkins Lymphoma... concurrently

Has anyone on this forum experianced both Hodgkin's Disease & non Hodgkin's Lymphoma at the same time?
My mom, who is 80, was diagnosed in March with classic Hodgkin's Disease. After having undergone 12 weeks
of ABVD chemotheraphy, that condition seems to be somewhat under control. However, a recent biopsy returned
positive for a low grade non Hodgkin's Lymphoma. While some people go out and get second opinions, my mom
has had four opinions from different oncologists. Two oncolgists feel that she is a "not" good candidate for radiation treatments given her age, her other pre-existing health issues and the risks involved with the administration of radiation. The other two oncologists feel that she "may" benefit from radiation... with no guarantees, of course. All, however, say that the decision to undergo or forgo treatment is ultimately hers. At this point, she's physically, mentally and emotionally depleted; so, she's opted to forgo radiation.
So, does anyone out there have any insights on this?