I use Probios for cattle or horses, it is like the gel version of yogurt and alot less of a mess. They also have probiotic pills in the pharmacy section called Lactobacillius that are good too.
I had this same issue with our litter from Christmas, I put them on Albon with no success so I wormed them every other day with Valbazen/Ivomec and put them on a new dog food (4Health Puppy) .... then I put them back on Albon (generic mix your own) for 14 days and they FINALLY came out of it, I was on the verge of throwing in the towel because they looked terrible and smelled awful but when they came out of it they shot up like little weeds but I think they might be a little stunted from the Coccidia.
I do not give Parvo shots anymore as I have seen some react to it and still get Parvo so I just quarantine them until they are 16 - 18 weeks old in the big puppy pen. I think we may have given them one set of shots at the husband's insistance and if I am not mistaken that is when all the issues started so I am not sure that they didnt get a weakened immune system from the shots and then maybe picked Coccidia up instead
Best of Luck with her!