You could keep your opinion, or read this and see that Bungie confirmed she is a Warlock.
[url]https://gotgame.com/2014/12/19/destiny-interview-bungie-community-manager-eric-osborne/[/url]
Edit: Here is a quote from that article:
Jeffrey – She is in the Tower, so that must make her sort of trustworthy. Otherwise, the Speaker wouldn’t let her in, right?
Eric – Yeah, she’s a Warlock, so she’s a Guardian. She’s a protector of the City
English
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Oh? Thanks. :)