Her username was biscuitsandbandages and her thread was the reason I first joined Mumsnet in 2014. I have just re-joined because I read your post @Scottishdreams1991 .
In 2014 I was a long-time lurker, but 'biscuits' thread leapt out at me. I had just overcome Acute Lymphoblastic Leukaemia diagnosed two years earlier, in my 40's. ALL is rare, perhaps 200~ people a year are diagnosed. It is one of the hardest blood cancers to treat because it is so aggressive and the treatment has to be equally as tough. I posted to tell 'biscuits' that I was a survivor of ALL and she could be too.
I got to know her through DMs and eventually when she passed away later that year her name and pictures were made available by her family via links. That was a lovely touch and the picture of her holding her baby in happier times will stay with me forever. There is hardly a week when I do not remember her brave spirit and soul.
Theresa was a GP and she told me one of her biggest fears was catching an auto immune disease, her body under attack and not being able to fight back. Theresa was living her fears and this was more heart-breaking because to undergo the heavy treatment protocol that potentially saves lives she had to be separated from her baby, but she had a loving husband (still has I guess) and a loving family who took care of her.
We never found out how Theresa died. Part of the protocol is a stem cell transplant from a matching donor, though an allogeneic transplant can result in an over powering immune response that attacks the whole body. This is the riskiest part of the treatment, but most people are lucky enough to pull through. It is sad that Theresa did not. It is sad her baby may never remember her, though if she has just one ounce of her mother's spirit, life will be kind to her. I am going to light a candle for Theresa now and say a prayer for her family.