Is it okay to be mad?

My wedding is in April and we have our first dance song picked and gave our DJ our song list before Christmas. I was at a bridal fair with her on Sunday (her wedding is in September). When we were walking in I turned to one of my bridesmaids and said this was our first dance song. My MOH then said the song is on her top ten list. I kind of thought she would cross the song off the list (if it was the other way around I would have crossed the song off). Last night she text me saying that we might have the same first dance song because they really like the song. Our weddings are already too similar, almost the same colors, same center pieces, bridesmaids will be in the same color as my bridesmaids. I just feel like she is straight up trying to copy my wedding. Am I being silly for being upset about this or is it totally okay to feel like this? I also haven't said anything back to her. I don't know what to say! 

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