I read somewhere that choosing to be late is about needing to be in control...I know that doesn't help, but maybe she feels that is the one thing she can control.

Unfortunately, if she chooses to keep being late, she will have to suffer the consequences. Sometimes kids/people only learn when there are...consequences. You cannot force her to be responsible...I know the frustration ; I had a son like that; all of the meetings in school, talking, etc.....did not work; he had to figure it out for himself.......he didn't graduate with his class, and chose instead to go to Summer school.

I thought he would be a failure and never amount to anything, but he found his own way....and is now the owner of a successful business; I never would have believed that.

It is hard to do, but I would STOP telling her what to do (she knows).