YOU SAID:

its very very confusing sitting her and doing nothing all day

INTO JAPANESE

彼女を座らせて一日中何もしないで

BACK INTO ENGLISH

Let her sit down and do nothing all day

INTO JAPANESE

彼女は一日中座って何もしない

BACK INTO ENGLISH

She sits all day and does nothing

INTO JAPANESE

彼女は一日中座って何もしません

BACK INTO ENGLISH

She sits all day and does nothing