How important is oral reading fluency?

My daughter is going into 4th grade, she is above grade level in everything except oral reading fluency. Her reading and comprehension is above level, she got 100% on every spelling test all year and is great at math and writing (not hand writing though LOL), she is going into the NOVA program next year. I have not made her practice oral reading a lot because she is just slightly below where a 3rd grader should be at end of year. Her teacher commented and now she is worried. Would you make her practice, I told her it is ok to not be perfect at everything. We have kept up on reading this summer and refreshed times tables and division. I do not make her read aloud because usually her younger sister is also reading at this time. What do you think?