Dear Darion,
At the same time, don't be shy about making sure that your mom's friends, neighbors, co-workers, church/club members, old alumni, etc. are aware of her need and aware of the possibility (and risks) of donating. There might be other potential donors of her age (or older) as well. Some kidney recipients eventually need a second (or third) transplant if the first one fails after a short or long time. Of someone else of your mom's age donates now, you could be "in reserve" for the future if needed, while that potential donor might be judged to be too old in 15 or 20 years. So, just something else to keep in mind.
best wishes,
Fr. Pat