depending on how the eye heals, you might be able to leave it and it might just shrink up eventually. If there are issues with healing, or fluid behind the eye, you might remove it and have the eyelids sewn shut. She will adapt to whatever vision she does or does not have.
My daughter rode her mare, with one eye in barrels and poles and she was fast fast fast in both. The blind side actually was her better side for turning. No issues at all, the injury happened about 10 years before we bought her...
It was almost funny at the barrel racing events, people would stare at her and make comments before she got in the gate, when she got done running, they were open mouthed at her ability and speed.We got to finally joking about people asking" is your horse missing an eye?"... (hmm, lets see, eyelids sewn shut, no "bump" from the eye in the socket, you think???). We would say to each other" Oh heck, she must have lost it in the trailer, it was there when we loaded her up".
Anyway, anything you might have to do in the future will depend on how it heals.Since you did good and got a vet out immediately, there is a good chance there will be a scar on the cornea, and she might or might not lose vision, but you will probably not have to take the eye out.
It was an accident and nothing you did could have prevented it. Don't make yourself sick about it,she was just coming to see you and it happened.