Hi Sad Daughter,
Welcome to the site. Sorry that you had to find us all and I am sorry to hear about your mum. But I am glad that you have joined us all here as ytou will get loads of support and help from everyone here.
My dad went through that horrible itching as well and like you, I hated seeing him that uncomfortable. He had a stent inserted into his bile duct to help get that bile flowing again and unblock the blockage that causes the itching and the jaundice. In my dads case, he had a metal stent placed but you can have either a metal or a plastic one inserted.
As the others have asked you, do you know if your mum had a stent inserted? If not, I would suggest that you get your mum seen by her doctors as this needs to be looked at now if she does not have a stent. And if she does have one already then it also needs to be investigated as well as it could be the case that a stent has clogged up causing the blockage again and the itching.
Please let us know how things go for your mum and know that we are all here for you.
My best wishes to you and your mum,