She can't use it anymore without the AC/Adapter, so I'm guessing the battery doesn't recharge anymore and needs to be replaced.
I have been searching my rear end off to find the correct type of battery, but I just can't find a definite answer.
On the components list from back when we bought it, it says "smart Li-Ion battery 8 cells 4400mAH"
Any help appreciated. Information about where I can buy/order in Europe gets bonus points.