she is good; she is good at
She is good at what she does.
Ella es buena para jugar tenis.
She's good at playing tennis.
She is a good student.
She is a good kisser.
Ella es buena para hablar en inglés, no lo es menos que su hermano.
She is good at speaking English, no less so than her brother.
She's good at skiing.
Ella es buena, Teniente, debería darle una oportunidad.
She's good, Lieutenant, you should give her a chance.
Aun así, ella es buena para los idiomas.
Even so, she's good with languages.
Pienso que ella es buena bailarina.
I think she's a good dancer.