I'm also going to start putting your situation in spoiler text, since no one else can see you. The range on color spray is only 15 feet. Irene is about 25 feet away from her opponents. I'll assume she moves forward 10 feet then casts the spell.
Irene dashes bravely forward, and sends a bright arc of startling colors flashing before her opponents. Unfortunately for the young halfling, neither opponent seems affected. With a cry, the bugbear leaps forward and whirls his greatsword in a high arc, slashing it down on Irene. Her last vision is of blood and pain, as the blade strikes her along the head. (10 pts dmg. Irene at -1. Sadly familiar fate for the hapless wizard. Sorry. You were rather unlucky with the bugbear's spot check, will save, and attack roll...