I just bought my daughter her first road bike. She is TINY, however, she's able to ride her new (to her) Fuji Finest 1.0 44cm pretty well. It is a tad too big for her, but probably just for the next few months. The stem on it is a 100. I'd like to shrink that down so she can reach the hoods a bit better. What is the shortest stem you would recommend putting on there. I know the shorter they get the twitchier the steering gets. 70? 60?

Thanks.