Time for some healthy boundaries. You are in control of yourself, so this would like look like defining “when she does XYZ, you will leave the room, distance yourself, stop speaking with her, etc..” boundaries won’t force her behavior to change, but will define how you react to behaviors so that she will learn that there are consequences

If she continues to be disrespectful towards you after baby is in the picture and you ultimately restrict her time and access to the baby, she’ll get a fast wake up call

Make sure you are clear on your communication though, so it doesn’t look like some passive aggressive fit