N.S.
5 years old and forced to practice 1.5 hours a day? I can't imagine that, but I do imagine she will hate piano shortly if she doesn't already.
My piano teacher is world-renown. He has worked with major artists, has recorded albums and even made music for movies. He gives music seminars all over the world.
He suggests 10 minutes of practice a day. For everyone. For a child, one minute, ten times a day. That's one minute of ten different exercises every day. Doing exercises is PRACTICING. Pick one exercise. Make her do it for one minute. Then STOP. Have her do a different exercise some other time that day. Then STOP.
Then, she should PLAY. That is fun. She could play as long as she wants, or as little as she wants. Playing is playing a song. Enjoying it.
Music comes from the heart and soul. It is a form of expression. It is art. It does not come from drilling it 1.5 hours a day for candy. It does not come from someone else forcing you to play. It does not come from stress. If your daughter can't enjoy music, if she can't play it from her heart, if she can't express herself with it, if she can't have fun with it WHAT IS THE POINT??????
Please find a way to stop yourself from pushing her. You are robbing her of the joys of music. As a musician myself, I can't imagine someone forcing ME to practice for 1.5 hours a day. I play because I love it, because I can bring enjoyment to others when I do. If I was forced to play, that essence, the artist in me, would die and I would be nothing but a person playing notes.