pequeña
pequenita (with ~ over the 'n') if she's very small
Tengo una pequena chica. If you have a daugther you say: Tengo una hija
niña loca
Nina or chava
Niñita torpe/tonta.
la niña la chica (the little girl) la muchacha
Woman is correct mujer Girl you can say muchacha,chica, and also Nina (if you talking about a little girl)
You can say "linda niña pequeña" in Spanish or "mignonne petite fille" in French.
esta niñita es graciosa
Amigo is one way of saying friend in Spanish. Amiga is for a girl.
Speaking of a girl, "little one" is ocis ikwesins."My little one" is nocis.
"Hello little girl" in Spanish is "Hola niña." It is pronounced "OH-lah NEEN-ya". Please see this site for confirmation of the translation: http://www.answers.com/library/Translations
Callate, chiquita! No, solamente bromeo.