"The spot itself isn't dark anymore, but tends to match the color of whatever she's looking at. "
The mighty brain adapts and actively adds the most likely content to the perceived image, effectively covering the blind spot.
In his book(s), V.S. Ramachandran, a US neuroscientist with a knack for publicity
, describes several different accomplishments of the brain around the "optical machinery". Common ones
(everybody has a blind spot in both eyes and the brain covers it up) and weird ones. Like the blind woman who "can" see - but experiences the seeing more like an imagined picture and not as a seen reality. Very interesting.