Why is my guinea pig so angry?

I've had my female guinea pig for about 3 years now and shes been very moody and crabby lately. I only have her so she is alone. I known this isn't recommended but she's a very territorial alpha female and pairing her with other pigs doesn't work. She's been alone since I've had her so maybe... show more I've had my female guinea pig for about 3 years now and shes been very moody and crabby lately. I only have her so she is alone. I known this isn't recommended but she's a very territorial alpha female and pairing her with other pigs doesn't work. She's been alone since I've had her so maybe shes used to it? Everything else is fine, she's eating, she's clean and healthy but she chatters her teeth a lot and bites me. Any advice or tips?
3 answers 3