She is engage

Last week when I went to work my co-worker was so happy to see me. I was wondering why and she told me that she just got engaged. I knew that she has been waiting to be engage but I never thought that it would be so soon. I thought that maybe it will be later this month but no. she showed me her sparkling ring it was really nice. I told her congratulation and told her that I was so happy for her but I was also sad that I never receive an Engagement Party Invitations from her. I know I am not a family or friend I am only a co-worker. Now she is busy planning her wedding. She wants it to be married earlier next year.