Thanks for being there for your mother.
You really need a solid conversation with her doctor, and to bring quality of current life into the conversation. If you do choose to try BCG treatment, it seems that you need her care team to be ready to act to prevent discomfort or distress.
In my experience, and from the experiences of others, the bodily effects of BCG are highly individual. Some report no discomfort while others, including me, have major pain that can last a couple of days. Everyone seems to react differently.
That said, the dosage of BCG can be reduced down to one-third or one-tenth, according to various reliable sources. Most if not nearly all sources state there is no reduction in benefit from a reduced dose, while sources differ on the question of reduction of side effects. Talk to the doctor.
Other treatments may be available, may have less expected side effects. Again talk to the doc.
CIS is considered to have the ability to spread quickly, but again, it depends on the individual. I have CIS and would love to find a simple answer to that question.
Hopefully her care team can address her comfort as a first priority and design a treatment plan that is acceptable.
Best
Jack
