Mum not eating much at all

[Bsmirched]

Mum is 85 and lives alone in a warden controlled flat. I am an only child and have incurable breast cancer for which I have chemo every 3 weeks.
Mum's diet has gradually become more and more restricted over the years to the point that she pretty much now eats corner yoghurts and the odd mini magnum. If I take her for lunch she struggles to eat half a sandwich.
I have tried many times to get her to eat other food at home, (I do her shopping), but anything I get usually just festers in the fridge. This happens when she's suggested something that she might like - I get it but she doesn't eat it.
When I try to discuss it with her, I just get told that appetite declines at her age and to stop telling her off, which I'm really not doing! I've recently got her some Fortisip shakes but she's not even drinking those.
She's just cancelled me going today because she says she has no energy and doesn't feel up to it, but she refuses to accept that it's because she's hardly eating anything.
I really don't know what to do. She's very against the idea of carers and to be honest, I don't think they'd have any more success than me.
Any words of wisdom greatly appreciated!

I’m sorry you are going through this too. I’m sorry, too, if I have been too blunt - it is hard to take in thoughts about your loved ones dying, and of course I am not an expert. I had no idea my mum was dying, and then a few months after she died I saw a video with a hospice nurse explaining the process, with timelines, and it matched so precisely what had happened that it blew my mind. It helped a lot, in an odd way, to know that it had been a natural and predictable sequence, even if I hadn’t realised at the time.

I hope you have lovely moments with your mum and time to say what you need to say to each other. My mum’s time in hospital was precious for this reason, even though it was tough.