[Fluffagrams]

Where is her cage kept? If she's kept in a busy room where the children are playing, then she may be being woken up by the additional noise and that could be making her a bit grumpy.

My chinese female can get quite grumpy if I dare to remove any of her special toys and until she's got things back how she wants them she can be a bit out of sorts. Thankfully I know what she's like now so I'll minimise disruption to her cage as much as possible.

I'd agree with some of the others suggestions that it may be a hormonal thing. When May was still quite young there were a couple of times when she'd be in heat and an absolute nightmare and the only times she'd ever bitten me has been when she'd been in heat. She settled as she got older though and whilst she's still a live wire and doesn't sit still she's not a biter.