The great thing about repainting her eyes , is you really can't go wrong. If you make a mistake you can take some dampened tissue and wipe it off, or if it's dried you can use acetone to remove the paint and start again.
It really just boils down to practice, what better time to practice than now? Nothing bad will come of it, you can play around with a few different ideas and find an eye style that you like.
There really is no point in keeping her as she is if you don't like the way she looks, so have some with her, not only will you fix her up but you'll learn how to do eye repaints and what works best for you along the way