Is my mum in the final stage(s) of Frontal Lobe Dementia?

Hi,

My mum has been suffering from Frontal Lobe Dementia for close to 3 years. She's currently in a nursing home: totally bed ridden (2.5 years), tube-fed (2 years) and unable to talk (1 year).

For the past month, she's been having urine retention and had been using a catheter. Just last week, the doctor had planned to trial off the catheter (as per protocol). However, she still has urine retention so they placed the tube back. Her stomach is also extremely bloated and she's drooling a lot too.

My mum had been having kidney problems for almost 10 years prior to her dementia (she's 69 year old this year).

Would anyone be able to shed some light on the urine issue? Is it caused by her kidney problems (worsened by her dementia?) Is it due to her being in the final stages of dementia?

I'm very vexed and troubled, as the doctors told me it's not advisable to send my mum for further tests to determine her kidney health as she's very frail. Hope I could get some advice here.

Thank you.