That’s sounds about right. I had a right old dance with BT trying to get my Dad’s contract terminated when he died a few years ago. He was living with my Nan for the last year of his life. I was patient and understanding with them until they tried to hassle my 93 year old Nan to pay an “early...
Firstly, sorry for your loss. You have my sympathies.
The debts will be payable from her estate and this will be a part of the probate process. You can try and hope they just forget about it but then any inheritance anyone receives would be payable to the companies if they do catch up with you...