Does she like me?

Theres this girl in my science cl, sits next to me, and shes always talking to me and smiling, i saw her at a paty, and she kept grabbing me by the hand and trying to get me to dance, (i dont dance), then that same night, i had a stain on my shirt and she came over and tried to get off, and smiled, thn later when she was leaving, she again came ans bye, cya on monday, My best friend tells me that she likes me, Does she? shold i asked her out?