My friend was touching herself right in front on me!!?

So last night my friend spent half the day with me but she also slept over so anyways this was the first time she has came over but here's the story well we were on the computer n I wasn't rlly paying attention to her but she was sitting on the chair and I was sitting behind her on the bed and I saw her put her fingers by her vag and like go into here basketball shorts and then she smelled it..I'm like what the hell is she doing!! Then she kept doing it like perodically when we we sitting there and I also saw her taste it! :0 and we were talking in my bed I saw her hand disappear and come up to her face and she made then mmmmmmm sound! Yuck! She's like srry I like to smell/taste my fingers! Ewwww I kinda think ik what she was doing but isn't that gross! Why did she keep doing that! What was she doing? Something else is that im still trying to figure her out since that was the first out of softball meet shes like rlly inapropriate and says things about di**s and feels comfortable saying pus** around me!! And she's not like some weirdo she's rlly awesome she's one of my besties lol well ty