YOU SAID:

she'll be coming around the mountain when she comes

INTO JAPANESE

彼女が来るとき、彼女は山を回ってくるでしょう

BACK INTO ENGLISH

She will come around the mountain when she comes

INTO JAPANESE

彼女が来るとき、彼女は山の周りに来るでしょう

BACK INTO ENGLISH

She will come around the mountain when she comes