hobby , my girl's case similar to you and we go back to the 健康院 for further checking. But My girl is worse than you because she not only sleep less (10 hours a day) but also eat little (although her weight is porportional to her height). So 健康院 says she may need to see 營養師 as well.
recently, she also sleeps less than 10 hours every day that made me worried ... and she ate a lot ... she will be 34 months, but only 86cm tall, how about your daughter?