User blog comment:Epic~00/Character Appreciation - Week 45: Sierra/@comment-27157772-20171107005458/@comment-4726418-20171107190355

Because Sierra isn't a naturally malicious person unless it involves protecting people she cares about. If anything what you're recollecting is a good thing since she vocally admitted she was playing Heather by faking sincerity right back at her; "I'm playing Heather "