I am confused with the tense when I use a sentence to describe two things has happened at the past.

The data has not been removed after she has gone.

Do I use the correct tense?

The situation is I supposed to remove the data after she left.

I am confused with the tense when I use a sentence to describe two things that have happened in the past.

The data has not been removed after she has gone.

Is that the correct tense?

The situation is that I'm supposed to remove the data after she leaves.