Loyal

This is how dictionary.com defines it:

loy·al

1. faithful to one's sovereign, government, or state: a loyal subject.

2. faithful to one's oath, commitments, or obligations: to be loyal to a vow.

3. faithful to any leader, party, or cause, or to any person or thing conceived as deserving fidelity: a loyal friend.

This is how I define it:
shei·laIf any of you knew this gal (yes, she's definitely a gal), you would most certainly agree.
She will do anything and everything for a friend. Now that's loyalty.
-Thanks, Sheila for being with my mom when I couldn't be. You're such a stud! (Troy is pretty cool, too!)