es mi amiga = she is my friend
"Es mi amiga" means "She is my friend" in Spanish.
la casa de mi amiga es bonita!
no es mi amiga, es mi hermana
You would say "Ella no es tu amiga." (or su amiga for the formal you, usted) If you mean 'She is not my friend' - "Ella no es mi amiga".
Mi amiga. Amiga is the feminine form of the word for 'friend' so you don't need an extra descriptor as you do in English to announce that your friend is female; the noun itself tells her gender on its own.
Maria es mi amiga.
mi amiga es mala
My friend's house is pretty.
This is Amalia, my friend. It is a manner of introduction.
"Mi amiga es la más Bella y bonita" is a redundant statement that means "My (female) friend is the prettiest."
This phrase translates to "My friend Makiko is from Tokyo" in Spanish.
"Alicia es mi" is not a complete sentence in Spanish. It seems like it might be the beginning of a longer sentence, for example, "Alicia es mi amiga" (Alicia is my friend) or "Alicia es mi hermana" (Alicia is my sister).