彼女の言うことは

what she says

→ 彼女
phrase Uncommon #18,951
what she says 彼女の言うこと means “what she says,” and は marks it as the topic of the sentence. It is usually followed by a comment about her statements or opinions.
JA: 彼女の言うことはいつも面白い。
EN: What she says is always interesting.

彼女の言うことは何でも通る

Whatever she says goes.

概して言えば彼女の言うことは正しい

Generally speaking, what she says is correct.

彼女の言うことはそっくり本心からとは言えない

You can't say that everything she says is completely sincere.

彼女の言うことは必ずメモを取って下さい

Please be sure to take notes on everything she says.

彼女の言うことはわからない

I don't understand what she's saying.

彼女の言うことは信用できない

You can't trust what she says.