5 year old misbehaving and driving us crazy - looking for a book recommendation

[Pooshweens]

Our 5 year old is lovely but is being a real handful at the moment, almost bullying her little brother at times

I find myself yelling at her but that doesn't work, and just repeats the cycle anyway, it's not setting a good example

I need some coping strategies - can anyone recommend a helpful book for this?

Thanks

Little Angels is probably what you need but it's out of print now. There are sone copies for sale on Abebooks though.

And it's actually evidence based rather than being written by someone with no children, and not based on any facts like a lot of other books aimed at parents