YOU SAID:

If she said that if he said that she would go

INTO JAPANESE

もし彼女がそう言ったら、彼が彼女が行くと言ったら

BACK INTO ENGLISH

If she says yes, if he says she's going

INTO JAPANESE

もし彼女が「はい」と言ったら、彼が彼女が行くと言ったら

BACK INTO ENGLISH

If she says yes, if he says she's going