K.B.
It's not so much that she's jealous of her little baby brother, but trying to show you that she is feeling neglected or rejected because she is not getting the same attention she is used to getting. If you haven't already, I'd enroll her in fun activities that interest her to keep her distracted so that she can develop self-independence and talent. I have my 3 year old daughter enrolled in ballet classes and she loves it. Now she wants to add activities this summer which is soccer and swimming lesson. Then she will start preschool in the fall, 2 days a week, which she has been looking forward to, too. Maybe you daughter just needs to stay busy. If you're at home, find something fun for her to do like an art project or something. I am having another baby in a week and I haven't been feeling well and can't seem to do anything with her and I can tell that boredom drives her crazy, but when she is doing something she enjoys, she is fine. Hope this helps! :-)