Am I crazy??

So last night we had a family party and one of my girl cousins (she's 18) was there with my other cousins, my husband and I. We were all talking and laughing, just having a good time. I noticed that everytime I looked over to her she was looking at my husband and when she noticed that I was looking at her, she would suddenly move her gaze...I noticed it a few times and it was always the same thing..when I would look at her she would look away super fast...I'm 23 and my husband is 22, could she be crushing on him??