Hi!
Try these piggy whispering tips to assert your authority and establish a piggy hierarchy with you at the top. Make sure that you invite your sow into your herd and tell her you love her before you tell her off and always end with a gesture of love.
Understanding Prey Animal Instincts, Guinea Pig Whispering And Cuddling Tips
Is she a single piggy? In that case you are at the receiving end of her trying to establish a hierarchy with her at the top due to the power vacuum as she doesn't have company of her own kind to socialise with. Guinea pigs are group animals that live in a strictly hierarchical society with round the clock interaction and company and they continue to think in that frame work like you continue to think as a human of your own social and cultural background.
If you want to replace what she doesn't have, you have to think like a guinea pig, but if at all possible, please find her a same sex mate of her own kind. That is the best and most loving gift you can ever make her.
Companionship