It would depend on the cause but a round of corid or Toltrazuril to start with will get rid of coccidia, which is a common issue. Giving B vitamins during treatment with corid makes the treatment pointless however.So when lying down her keel feels sharp but upright it is not. So in the instance it is gut infection/parasite what are my other options?
Then there’s the antibiotic SMZ TMP to treat coccidia and a number of other issues.
Giardia and clostridium are treated with metronidazole, Tylosin will treat clostridium and a number of other issues.
These can either be obtained through a vet or by fish or pigeon antibiotics off the internet.