Solamente senoritas/muchachas
Voy a mis amigos(as if only girls)
millas
No las niñas.
muchachas Mexicanas
Amiga is what you refer to as a friend that's a girl. Amigo is for a boy you would call a friend. If it is a group of friends with only girls you say amigas. A group of boys you say amigos. Boys and girls together you say amigos.
Las ninas felices
Me encantan las muchachas.
Me gustan las chicas
tres mujeres jóvenes
girls, debriefia and boys, debriefio
noche de chicas
la estila bonita