Hi Bobbie, just remember...your Mum is only a couple of days older than she was without " Dementia".... in other words she is still the same, still your forgetful little old Mum.
The main things to concentrate on at the moment, while/if Mum still has capacity, is to discuss with her and SDad, have they got current, up to date wills, and would they consider completing the POA forms? They can now notify the LA Council Tax Dept as they should be eligible for a discount.
At the moment, being early days, it is really just a time for research and when you do, remember that not every PWD ( Person with Dementia) gets every symptom.
Keep in touch, there is a depth of knowledge here to be shared.