Right when vs just as

How would you say this sentence please? Which are right, which are wrong, which would you say?

Just as/right when I was coming out, she left.

Just as/right when I was coming out, she was leaving.

Just as/right when I was going to come out, she left.

Just as/right when I was going to come out, she was leaving.

Just as/right when I was going to come out, she was going to leave.

I've asked this sentence with When how about Just as or right when

Just as/right when the train was pulling in, she was eating.

Just as/right when the train was pulling in, she ate.

Just as/right when the train was pulling in, she ate.

Just as/right when the train was going to pull in, she ate.

Just as/right when the train was going to pull in, she was eating.

Just as/right when the train was going to pull in, she was going to eat.

Thank you