Solamente senoritas/muchachas
Voy a mis amigos(as if only girls)
millas
No las niñas.
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.
muchachas Mexicanas
girls, debriefia and boys, debriefio
tres mujeres jóvenes
Me encantan las muchachas.
acelerado for boys and acelerada for girls
Me gustan las chicas
Las ninas felices
noche de chicas