Our expert says:
Often one can manage this sort of situation, by giving her extra attention whenever you can catch her doing something good and right, and withdrawing attention when she misbehaves - yawning, looking bored, ignoring her ( if possible ), even The Naughty Chair. If she persists, express the rules very clearly, and the consequences. For each day she is pleasant to her sister, she earns a star on a chart, and 7 stars in a row earns something (modestly small ) she likes. Any time she is unpleasant to her suster, she gets no star that day, and maybe even loses 2 existing stars.
Hitting is useless. Punishment in the sense of losing affectionate attention, and losing privileges and pleasures, does work, so long as it is applied consistebntly.
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