I hope some of the very sensible suggestions PPs have made are helpful, OP. It's so difficult being in that situation, without people being so crass and intrusive when you're struggling to deal with everything else.
I hope your mum is as comfortable as possible, and you're getting help and support from the carers and those close to you.
Some people are either grossly insensitive, grossly nosy, or both.
My mother took her own life. She was 83.
At her funeral, l was questioned (quite forcefully, in some cases) by several family members (not close ones, cousins at best, the sort you only see at weddings and funerals, and who had never been near, or seen me nor my mother in years) "Did she have cancer?" "Had she been ill?"
Only two of my closest relatives (cousins who both l and my mam were very close to, one had actually informed me that my mam had died as l lived away) knew what had actually happened.
My mam was almost paranoid about 'what people thought' so l wanted to keep things quiet in that respect, for as long as possible, for my cousins' sake at least. They lived near my mam, l didn't.
Some people really don't consider (or, indeed, care) about what kind of effect this sort of intrusion has on the family members who are dealing with the situation. There seems to be a 'need to know' or 'offering unwarranted and inappropriate advice' culture and it's totally unnecessary and hurtful.