Just watch it, and her. If it is just a burst blood vessel, as scary as it looks, it is harmless and painless. Happens to people all the time, and they don't even feel it, so it's a big surprise when they look in the mirror.

And of course she'll have our prayers.

But if this is the second time she's run into something, perhaps she needs her vision checked at her next vet visit.

This page has an image of a person with a burst blood vessel in her eye, so you can compare.