Baby Name Thief

We found out today that we're expecting a little boy, and we decided to name him Lincoln. It was the only name my husband and I agreed on, and we love it. I told my sister-in-law, and she immediately said I stole her favorite baby name. She's not even pregnant, or trying to get pregnant. I feel like she may have said she liked that name once, but honestly how can I be expected to even remember that? I was so excited to finally name my son, and she really hurt my feelings. Has anyone experienced this?