My Mother's nails are very flaky too and to top it off she has psoriasis in them, which makes them even worse.
She is very heavy handed and just doesn't stop and of course I've been telling her to wear her Solar oil daily, but I might as well be talking to the wall.
The last time I did her nails for her, her nails were as flaky as ever and I insisted she use her Solar Oil at least twice a day and she promised she would... she was shocked at the difference it made and her nails aren't as flaky as they used to be. I don't have any after pics I'm afraid, but she wears Shellac and usually gets three weeks (if not more) chip free. (it's so hard to pin her down so I can re done them)
I do have to very lightly remove the flaking first, because if I didn't the Shellac would flake off with her nails.
Her natural nails have never looked as good since she started to wear Shellac and she can't live without it now.