Unfortunately it is the Clindamycin that is causing the upset tummy (it has the same effect in people) and you are right, it is nasty tasting. You can try masking the taste with tuna water or clam juice, but I doubt it will have any effect. The pills/capsules have the same problem, but maybe you could use a "pill shooter" to get it down. If you are really stuck it does come in an injectable form (http://www.medicinenet.com/clindamyc...on/article.htm)

Good luck and I hope she can keep at least some of the medicine down...