She's bipolar. If you don't know what bipolar is than, well... There are 2 types, Bipolar I and Bipolar II. Basically the only difference is the amount of times it swings and the time it takes. Eg rapid cycling might mean your moods change a few times a day (like me thats II) or over a period of months, even years. When you're manic you can take risks, feel very confident, talk fast, be very excited, not sleep, be very socialble, feel like you can do anything, a bit like on drugs.