The girl keeps time traveling every time she pulls a servant bell cord.  She changes places with an ancestor who looks like her, I believe it’s a cousin, who used to live in a mansion.  Our girl goes in the past and the ancestor comes in the present.  They communicate by leaving each other notes to find, I think in the desk.  There is something that is happening in the past which is urgent.  I think the ancestor is being beaten, and the modern girl is trying to save her from dying.  Anyway, she goes back and forth from the present to the past and from the past to the present.  (I think she comes back to the president when she goes to sleep at night, I forget exactly how that worked).  Then, on the last time the modern girl needs to time travel, the bell cord breaks, and somehow she still gets back into the present by tweaking the nose of the statue of Caesar that is on the piano in the mansion.