Anko's my second favorite female character in the series, so I get where you're coming from for loving a female character with next to no screentime... (At least Tenten hasn't spent 150+ chapters being unconscious)
And as much as ShikaTema is my OTP, no, Temari does not exist solely for loving Shikamaru. Heck, one of the most important things she's done was at the end of the Kazekage rescue arc, in which she became the first person to actually tell Naruto
to his face that he has the power to change people.
The Temari vs. Tenten fight is canon, too. While it happened off-panel in the manga, during the Shikamaru vs. Temari fight, Tenten made this comment.
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So yeah, it actually happened.