You need to nip this in the bud and lay down some ground rules.
Get a bath mat where she is allowed to jump up and down and scream, and make sure she is put there when she kicks off.
You say you have anew baby? Or it her dolly she wants to bathe. Why not throw the doll in to the bath with her?
Or get some help and bathe the two of them together, paying special attention to her.
Why are you bathing her everyday? Is she that grubby?
Is it a rushed affair and seen as a chore?
If you do have a new baby she misses you and is crying out for help by raging against her loss.
Get a rug for yourself and jump on it when you're cross! Show her how it's done and that you survive. Sometimes emotions can be frightening, but they're just feelings, and we can choose another one if we are sure we don't lose ourself by having them.
Learning how to live with and safely express unpleasant feelings is a huge skill.
Feeling enraged and furious can be very frightening at the beginning, so draw pictures with her of sad faces, and happy faces and angry faces and don't be afraid to draw them big and red!! It's important she can label her feelings is she finds them frightening.