My sister has been acting weird, what does this mean?

Stephiepoo
Alright so, she has been very moody lately. One minute she would be screaming, the next crying, then she would be happy. She often tells everybody she hates them, blah blah blah. This has been going on for a year now. She doesn't eat decently, and when I am doing the dishes, I often find half the bowl of food still sitting there, and I have to throw it out. Last night, she wouldn't sleep, and woke me up at 3AM just to ask for the remote. She normally spends all day on the computer... etc. What does this mean? She is 10 years old.
My sister has been acting weird, what does this mean?
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