OK, so just to check I've got this straight: there was a lump on her eyebrow, like a spot, which then went away, but has left this patch where the hair is thinner. It's not itchy, but it does seem to be spreading now - is that right?
If so, I think my inclination would be to go back to the vet and say that it's spreading, even if it's not itchy. While most causes of hair loss in dogs are itchy, there are some that aren't. Mostly, these are fairly benign - it might be, for example, that the spot (a small infection) has left some scarring under the skin, or otherwise disrupted hair growth. Alternatively, and less likely, it could be one of the parasites that causes hair loss without itchiness, like Demodex. There are other possibilities too, and if it had just appeared and not done anything, I wouldn't be concerned, but if as you say it's spreading, it might be worth a recheck to rule out parasites or other issues.
Good luck!
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