Thanks so much for your very helpful reply.
The symptoms you, describe: shedding, dandruff, scabs, vomiting, hairballs and peeing out of box can all be caused a dry diet or lack of fluid an oil in the skin and fur.
Please read article written by a feline vet:
Feed her canned food with a tablespoon of warm water added.
Drain the water from a can of tuna and let her lap it up 3 times a week to up her fluids
The scabs are called miliary dermatitis:
You can apply raw honey to any sore or irritated areas. It is a remarkable healing agent:
In addition, add one quarter of a 4 mg chlortrimeten to a tablespoon of baby food chicken or turkey with no onion or garlic.
Give it every 24 hours. It is very tiny so she will not detect it
Add salmon oil to her food. It has a little pump so easy to do:
You can give her 3 drops of cranberry juice every day (by dropper) in case she has cystitis:
I know she has not been seen by a vet in a while. She should be tested for ailments common to her age.
They are: hyperthyroid, diabetes, renal disease.
Use a mobile vet so she does not need to travel or be expose to other (potentially sick) animals.
Please let me know how she is doing. Just press reply and I will be here for you.
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Bless you for taking such amazing care of her!