Maybe "She isn't a lady."
or maybe "She isn't married."
It means: Is the one.
It means "it is one" referring to a feminine noun, e.g. es una mujer = it's a woman.
Eso es como usted habla a una senora?
buenacosa
fat cow
It means, "That is a crazy question."
A
Well, first of all, it should be "ella es una doctora" and it means "she is a doctor."
to get a good grade is ninety
You are an attractive woman.
muchacha amiga
You are a liar