YOU SAID:

my mother went to go buy a cow then realized she was the cow

INTO JAPANESE

母は牛を買いに行き、自分が牛だと気づきました

BACK INTO ENGLISH

My mother went to buy a cow and realized she was a cow

INTO JAPANESE

母は牛を買いに行って、自分が牛だと気づきました

BACK INTO ENGLISH

My mother went to buy a cow and realized she was a cow