Cute as a button and such a wee one too! Found this info on -
Newborn Kittens
Eyes and Ears
Newborn kittens are born unable to hear or see. At birth, their eyes and ear canals are both closed. Kittens' ear canals begin to open when they are between five and eight days old. Their tiny ears, which are folded down at birth, begin to stand up and are completely erect by the time they are three weeks old. Kittens' eyes begin to open when they are approximately eight days old and open completely over the next six days. Long-haired kittens' eyes take slightly longer to open than those of short-haired kittens.
When kittens are born, their eyes are blue in color and remain that color for the first three weeks. After this time, they gradually change to their permanent eye color, and it can take up 12 weeks to make the full change.
Hopefully it'll give you some idea of a timeline for your wee one.
I'm glad that you took her in, I guess she'd be "too much work" for a rescue to handle (snort!).