Hi Tracey,
Well, first of all I would say it's definatley not normal for a toe nail to look like this after removing nail enamel.
Personally, I would tell her to go to the doctors, as I personally would not want to touch it incase it is a fungal infection. We cannot diagnose as you know.
How long has she had this?
It looks like it is crumbling, if you were to use your cutcile pusher, scraper on it, I'd guess it would come away in little flakes. That is like one of my new clients had, when I removed her old polish on her big toe(previously had a pedi elsewhere), there was an area in the middle of the nail at the side like this, not soo white looking though, and the hyponychium was not affected by this as it was higher up in the nail.
I said I was not happy about treating her till she'd seen a doctor & she admitted she'd had a previous fungal toe nail infection & was self treating with Tea Tree oil.
She was a regular nail client and spent a fortune and tipped very well, but I lost her as a client through my refusing to perform a pedi. I am not too upset by it, as she could of contaminated some of my stuff. But for her to decide to leave because of this is silly. She did not tell me that, I have assumed, as she wanted to have regular pedis every month and I would not do them until it was cleared up.
Sorry to waffle on!