sibling rivalry

Anyone else experiencing sibling rivalry before the baby is even born? I have a 7year old daughter and she gets mad because I am taking baths by myself rather than with her 1-2x a week, anytime I am folding baby clothes or doing anything with the baby stuff she get pouty, if asked if she is excited for her baby sister she says nope, and she is just doing a lot of attention seeking including at school. I am not caving to it and I am punishing her for it but if it's this bad before the baby is born good lord how is she going to be afterwards?