hey there. I have just recently completed pretty much the exact same treatments, same drugs, 30 radiation treatments, etc. My last 2 rounds of chemo though were after not during radiation.
I did not suffer really from radiation. Maybe a bit tired.
The chemo definitely got me though, and my tastebuds for sure not to mention my mood. I found I bounced back from chemo about a week after though. Best advice I got I think, was to drink, drink, drink tons of water. And if able to exercise, do it. I know exercise really helped me through my treatments.
The bottom line is though, that everyone is different and will recover from treatments in their own time. I think I was very lucky in not suffering too badly.
I hope your mom starts feeling better soon.