After season 2, Gabrielle seems to dye her hair light brown with blonde streaks for the first nine episodes of season 3, with the exception of the episode, Bang (honey blonde with blonde highlights).
Following Gabrielle's transformation after season 2, she experimented with different hairstyles, trying light brown hair with blonde streaks for the first nine episodes of season 3. Notably, there was an exception in the episode "Bang," where her hair took on a distinct honey blonde color with added highlights.