If you think she is a beast on offense, then you haven’t faced her yet fully emblemed on defense that much yet. That class of hers, Fighter, is oh-so-annoying when she revives more times than anticipated. That and her murderous nature, this purple rabbit (the only one I am missing from her portal) ain’t a slouch as she can be used both on offense and defense very effectively and efficiently.
Bera, while I just recently recognize her potency, suffers from many anti-minion counters, and I am afraid that more are to come in the future game updates. Some players even intentionally let them cast several minions multiple times only to find most, if not all, of them gone. As of now, I ignore her when she is defending, prioritizing killing the most threatening of her allies on defense.