I sympathize with you and assure you that I will try to answer all your queries best to my abilities
The blood clot that had happened before has caused the damage to cerebellum
of your mother. Now there is no point in surgery. What you need to ensure is that sHe takes her regular blood thinning medicines. The damage to brain tissue occurs very fast and it has some amount if irreversible damage which would remain even if clot is totally dissolved. So there is no point of thinking about surgery.