Sorry... I wasn't online, was outside doing chores. (Chickens were beckoning).
Well it depends - it's really rather hard to tell online what the situation is. Does she have diarrhea? Is it at all mucous? Or are her droppings firm and normal for the most part?
Definitely she should at least be getting the starter and clean water. Additionally, you could give her some probiotics and then add OACV (organic apple cider vinegar) to her water at a rate of 1 teaspoon per gallon of water.
The probiotics could be Probios dispersible powder or paste from the feedstore (1/8th teaspoon on something she'll eat quickly - or a Bb sized bit of the paste in her beak), acidophilis capsules (the contents of which sprinkled on something she'll eat with 10 minutes), or plain yogurt (1 teaspoon per 6 chicks) either by itself if she'll eat it, or mixed into a tiny bit of something she'll eat quickly.
All your babies would benefit from any of the above probiotics weekly during brooding, daily during any stress or potential illness, or whenever during adulthood. The only time you won't use yogurt is if you're treating with a medicine whose active ingredient ends in -mycin or -cycline (read the labels always).
The live bacteria in the above probiotics will colonize the gut of your babies and adults. The chicken digestive tract depends heavily on bacteria to finish the process of breaking down foods that the gizzard started. They also produce enzymes that make food digestable, and vitamins (B vitamins - great and important for growth), as well as (through competition) helping to keep infections under control. Good bacteria not only literally feed your bird, but they also act against bad bacteria, fungi, and to a certain degree make the digestive tract a little more strong against cocci.
Chicks are born without these bacteria. Naturally, they'd acquire them by pecking on their mother's vent and droppings as they tried to figure out how to eat. Her good bacteria (and some naturally occuring bad ones) would be digested by them and colonize their own guts. So it's important that the good bacteria get a hold before the bad can. It's first-come-first-serve in a baby's digestive tract. Since we rarely hen-brood babies these days, I give probiotics (usually Probios but sometimes yogurt) on the babies' second day of eating to ensure that the GOOD guys get the real-estate that is the digestive tract before the bad guys do.
So you can help get their gut bacteria back in shape. That might help firm up droppings, and help ease some irritation in the lower digestive tract.
The OACV helps in that the organic also has good beneficial colonizing bacteria within it. Additionally, that dosage of OACV will help make the pH of the gut return to a pH that is friendly for beneficial bacteria, and UNfriendly for pathogenic organisms (bacteria, yeast, cocci). Add to that the fact that it's a nice source of potassium which might help with the baby's energy. I'd do the OACV every other day, personally. The yogurt daily while she's ill, then taper both off to weekly during brooding. Weekly during the times before laying and first month of laying.
In the mean time, push the tissue in and reapply the prepH as often as it needs. If it's out, then re-treat.
You won't use OACV during Sulmet/Corid treatment if you do that. You WOULD still use the yogurt. You could just treat with Corid (as it's only a coccidiocide, while Sulmet is a coccidiocide and an antibiotic - a little more harsh) and it won't be too hard on the system. It could at least rule out coccidiosis and won't interfere with her other treats until we can firm up what might be causing this.
