Mary Sue Help!

[Yodaman]

My friend (Gollumxelfxgurl) and I are doing a series of fan fics called "War of the Ring", which is based off the video game. She said the main character should be a female elvish archer, so I said okay. But now I'm afraid she's going to be a Mary Sue. Here's her characteristics:

Name: Lúthien Elanessë, which is Gollumxelfxgurl's elvish name (see http://www.chriswetherell.com/elf/ ).

Personality: Rougish. Non talkative, stern, but has good leadership qualities and gets the job done.

Role in Story:

In the first episode, Haldir is leading his troops agianst the Butchers of Isengard, which are a group of magically enhanced Berserker Uruk-Hai. Haldir is defending a Rohirrim villiage (which soldier's all died and they need help), but the orcs are too much for him, so Celeborn sends another group of Wood Elf warriors. She wants to fight but she can't since she's a woman. So in true Dernhelm fassion, she disguises herself as a man and helps defend Haldir. Haldir congradulates her by giving her a medal, but then her helmet falls of and her identity is revealed. She runs away and becomes a rogue.

Love Interests: None

Is that too Mary Sue? Thanks

Yodaman