Hello and happy holidays,
I am sorry, Lori is not available. My name is ***** ***** it would be my pleasure to help.
You are very kind to care about your nieces cat.
The type of dandruff you describe is usually cased by dry skin, under-hydration or both.
If she eats mostly dry food she is not getting enough oil to lubricate her skin and fur.
You niece can add salmon oil to her food, up her fluids or feed her mostly canned food.
Please read articles written by a feline vet:
Drain the water from a can of tuna into a bowl and let her lap it up for hydration 3 times a week.
Get her a pet fountain to encourage drinking.
Please let me know how she is doing. If you have more questions, I will always be here for you.
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