ONE THREAD per pig please!
We really want your pig's history all in one place to help you. Pleasedon't start a new thread for a new issue. Just reply to your old one. We can edit the title for you if needed.
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I can't say for certain exactly what is wrong with her eye, but I can say for certain she needs to see a vet urgently. This isn't going to get better with just washing it.
Ideally in most circumstances you would want to see an exotic vet with experience treating guinea pigs, but eyes are the one thing that regular vets can treat on a guinea pig. Just don't let them give her any shots or oral medications without being certain it isn't on this list https://www.guinealynx.info/dangerous_medications.html eye ointments/drops are fine as long as you make sure not to get it on her fur so she can't get any off and eat it.
You need to find someone who can get her to a vet. Eye injuries are very painful, and that looks like a hay poke to me. Infection can set in, and cause the loss of one or both eyes.