I second CSA & SLW; you can make new holes with a pin to give her full lines of hair, and I too recommend the needle & thread or wire method, the knots will help to secure the hair in place. These methods are also usually a bit more gentle to the plastic than the tool method. If further splits occur while rehairing, just continue carefully, skip some holes if needed, and squirt some glue inside the biggest gaps after rehairing. If the neck splits, that is. It doesn't look that bad so it might well be that you'll have no issues rehairing her.