When we first got Luna she had this problem. She needs to feed her frequently, and this formula helped get my girl stabilized until she was eating on her own:
http://www.yorkietalk.com/forums/showthread.php?t=58036
The nutrical is good to get her going, but shouldn't be used too frequently, as it will cause the crash. She needs protein and good carbs to keep her blood sugar stable. One of the effects of coccidia seems to be the inability to keep blood sugar level on their own, as they really won't eat enough. Also, keeping the baby warm is VERY important!
Prayers going up that she is all better soon
