I am so sorry to hear that your Mum is so ill, presumably she is still in intensive care and I am sure that all will be done to help her recover from her operation.
She might still be drowsy and the effects of the sedation and anaesthetic still affecting her, double amputation is a major operation, it will take longer for her to get over that. Be there for her, encourage her, tell her that you love her, hold her hand, human touch is so comforting and important at times like these.
I hope that your Mum and you can move forward and become healthier once more or at least avoid deterioration of complications.
Thinking of you, let us know how things go.
Big hug
Judith x