formal dress drama...

Katie
I had sent one of my close friends a picture of my dress for our winter formal this weekend and told her all about how excited I was to wear it and where I got it from
Except the next day she went to the same store and bought the same dress in a different color!! 
Am I overreacting for being mad at her? I feel like she should have at least consulted me or asked but she just went ahead and bought it....