If tiers are considered, she's most likely lower mid tier, so that would be C right? The damage is decent, the speed is good, but her range is what really holds her back. She has to be up close and personal to do anything, and against characters that can space, she will struggle. However, I like her because she has the gimmicky mix up pressure going for her, like
@Saber stated. Also, like stated above me, stun launch is the best way to play her, because most of her damage comes from the juggles. My personal favorite juggle is 8K > K > P+K > P+K, if only because she incorporates Brad Wong's moves in the juggle. Though I believe the most damaging juggle off CB is 8K > 4PK > P+KKK (for lights and mids) and 8K > 4PK > 6K2K. On CB, however, I do also like to use 33K as a launcher in place of 8K to do additional damage OR do 33K > 6H+K > K > 2P+K46P (Eliot version).