OK you need to get an OT in to assess her.
She at least needs the Age Concern panic necklace or bracelet on. You can be a contact person so although remote you are a part of the decision making process as to what should happen.
She will need grab bars in the house at strategic points, OT to assess.
She may need something like Wiltshire Farm Foods to deliver her foods. You may do this yourself via tesco/sainsbury's other.
You may want to stop her using gas/electric cooker, you need to judge.
She may need hot meals delivered, OT and you to be involved with assessments.
She may need commodes, raised toilet seats, railing to get into the garden hang out washing, depends what ability she retains.
She may need a wheelchair for trips to shops etc.
You may need to assess whether you need PoA to protect her from abuse.
Occupational Therapist (OT) will assess what she needs, mum even got a full wet room as getting into and out of the bath was dangerous.
She may need a huge clock to remind her what day/date it is.
She may need a memory board to you or she can write important stuff on it "Take medication, turn off the fire" that kind of stuff.
Get an OT in (we got mum's from the hospital when she was admitted).
Get the Fire Brigade into assess her fire needs (they do this free) and will put in free alarms, they may need to be automatically linked to the fire station if they go off.
I'm trying to think of what else I've sorted for mum.
OK magnifying glasses, to read instructions as she forgets how to cook.
If she is determined to stay in her home, then it has to be as safe as it can be. If all this fails then you may need to revisit, but there is a lot you can do before it comes to that if she doesn't want it but her safety has to be key.