YOU SAID:
Elma is my best friend. She's so pretty.
INTO JAPANESE
エルマは私の親友です。彼女はとてもきれいです。
BACK INTO ENGLISH
Elma is a good friend of mine. She is very pretty.
INTO JAPANESE
エルマは、私の良き友人です。彼女はとてもかわいいです。
BACK INTO ENGLISH
Elma is a good friend of mine. She is very cute.
INTO JAPANESE
エルマは、私の良き友人です。彼女は非常にかわいいです。
it is unlikely that this phrase will ever reach equilibrium