Screaming at her is definitely the wrong reaction. Stay calm. Make sure that she is involved in caring for her baby sister as much as possible, maybe helping with changing the nappy or fetching a drink or tidying the nursery. Perhaps sometimes you could say something like 'you can't pick her up right now but you can sit in the playpen and play with her toys with her for a while'. And make sure there are times when she can under supervision pick up and cuddle her sister. If you just scream at her for showing the baby affection and punish her, then she will start to resent the baby. Sending her to her room is isolating her from the family unit, she will feel rejected. Involve in everything as much as possible. Get her to help you with the housework in little ways too, being mummy's little helper. Like the last reply said too, make sure you put time aside just for her each day, even if its just a story at bedtime. Make sure you give her lots of cuddles as she is obviously a physical child. I really don't think you have a problem as such, just how you handle it could create a problem.