Concerned toddler sleeping too much?

My daughter is 21 months old and she sleeps about 15 hours at night and has a 3 hour nap during the day. If i wake her up early than she is very cranky and has to have like 2 three hour naps. For example last night she went to bed at 9:30 and woke up this afternoon at 12:50. I just hope nothing is wrong with her.... show more My daughter is 21 months old and she sleeps about 15 hours at night and has a 3 hour nap during the day. If i wake her up early than she is very cranky and has to have like 2 three hour naps. For example last night she went to bed at 9:30 and woke up this afternoon at 12:50. I just hope nothing is wrong with her. She acts normal wit lots of energy during the day so I dont know if there is something wrong or not. Anyone have any answers or advice?
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