Glad you posted.
Tillie. I could not have said that any better.

Not trying to make a suggestion with my post.
But let you peek into my world for a glimpse of another hoarder.

I collect memories.
I had a TBI when I was young.
From then on I was disconnected from past.
Not amnesia, but I forget so much I can only sense my past except for the big traumatic things.

However when I pick up an old brush. I remember whom it belonged to. Someone I loved . I hold it and look at it and become flooded with the all the preciousness.

Even if the brush is dirty and unusable . It's like a portal to my past. How I wish this wasn't so.
A day or so later all that memories are out of sight out of mind until I touch it again.

I have only 1 object from my dad. I would be extremely defensive if someone tried to eliminate it from me. .

OK though . A whole house worth. I get it . It's a hoard. I have one. Myself, I followed Tillie's advice and I agree with what's she's saying to you're situation.

Hi 🙂
A good book for you to read is
"Digging Out".
It was written for people who have a hoarding person in their life.

At her age she will never change.
But you are allowed to remove hazards in her home for her own safety.
Let her keep most all her stuff but make pathways wider for emergence personnel to enter.
Reduce the height of the stacks to prevent them falling and burying her.
Make sure all doorways, halls and windows are clear for fast escape in case of fire.
Remove fire hazards, etc...

Most of all tell her you are doing this for her so she can remain living independently in her own home.

See if you can find a counselor who deals with hoarding to be the spokes person for you.

Pretty much just leave her as she is.
She is too set in her ways and trying to fix the problem will just end in fights and hurt feelings.

Good luck and best wishes 🙂