Sounds pretty normal to me Tegan.

Any new routines lately? Could be that, or it could just be her time IYKWIM.

Try not to react to it too much when she threatens to throw things at you and always follow through with your threats ie put her in her room if you tell her she will go there if she's naughty and don't give in to the whining. If you mean no then don't change your mind after 10 mins of constant pestering