YOU SAID:

I don't know how to say I like her to her.

INTO JAPANESE

私は彼女に彼女が好きだと言う方法を知らない。

BACK INTO ENGLISH

I don't know how to tell her that I like her.

INTO JAPANESE

私は彼女が好きだと彼女に伝える方法を知らない。

BACK INTO ENGLISH

I don't know how to tell her that I like her.