Need advice re FIT test.

[Bsmirched]

My mum, who is 85, has recently had a blood test. It's come back showing she's a little low in iron but not anywhere near low enough to be classed as anaemic. I know this is almost certainly due to her very limited diet.
To be on the safe side, the GP has suggested she gets a FIT test done to make sure she's not losing blood. Now, my Mum's short term memory is absolutely non existent, so I know I could explain how to carry out the test and she'd either forget to do it at all or how to do it. In addition she has terrible arthritis so would probably struggle physically.
If she did do it and it showed anything, I can't imagine she'd consent to anything invasive anyway.
I am the only person she has and I'm undergoing treatment for stage 4 metastatic breast cancer so also struggle with mobility.
Would it be awful to not even try to do the test?

I don't think it would be a terrible thing if the test wasn't carried out.

Would you be able to have a conversation with her GP though to go through the reasons for and against?
Does your mum have capacity to make a decision?

She does have capacity, she lives alone and copes ok with me doing her shopping and going in regularly. It just seems like a massive faff for no real reason.

Yes, I do understand especially if she won't go for any further investigations.
I think it would be worth trying some iron supplements for maybe three months and then re testing her iron levels. I'm sure if you speak to the GP they will understand the situation though.

I think I’d try everything to try and get her to do it. Line the toilet with paper, that makes it easier to get the sample. As someone who has lost 3 relatives to bowel cancer if she does have it you really don’t want it to be missed - the surgery and treatment becomes so much more invasive the longer it’s left and you can’t just leave it without treatment as (sorry to be graphic) the end result would be dying through the tumour perforating the bowel - this is what happened to my Mum. My Gran had surgery for bowel cancer at 85 and recovered well. She lived with it until she died aged 94.

Does she live nearby? Would she be able to keep a sample and you could help read the instructions for her to follow?

As a side, my nan had bowel cancer discovered in her mid 80's. Some people said- she is old and leave it be. She had a temporary colostomy bag for 6mths. She then had regular colonoscopies to remove any polyps. I'd often stay to help her during the prep.
She lived to be 102!

Thanks for your thoughts everyone.

@TheSparkling I think that's really sensible advice.
I think she'd be utterly horrified at the thought of living to 102! I'm all she has left and in all probability she's going to outlive me anyway.