YOU SAID:

i ate lunch with my mom and then ate her.

INTO JAPANESE

私は母と一緒に昼食を食べ、それから彼女を食べました。

BACK INTO ENGLISH

I had lunch with my mother and then ate her.

INTO JAPANESE

私は母と一緒に昼食をとり、それから彼女を食べました。

BACK INTO ENGLISH

I had lunch with my mother and then ate her.