So the most efficient basic combo/juggle from Helena is one that finishes with you in Bokuho and opponent in bounce, at which point you do a 6,6 to get close then 6+P+K for a close hit.
Simple examples of such a combo:
4P,P,K (counter), P, P, 4+K, 4+P,K, 6,6, 6+P+K
BKO 6P,P,K, 3+P+K, 4+P,K...