I agree, she stole your hit! It happens a lot. Congruency of how we look and present ourself to our pheromone signature is important. Problem is that it is often not in our control.
There is also the factor of individual preference. I have found that people always associate the attractive pheromone signature with the person who is more their type (that other girl may have been more to his type, so he associated the attractive pheromone signature with her).
Nothing to lose heart about. Someone who likes you sans pheromone will like you more with pheromone and might decide to come up to you and compliment you next time.