Quoting mommyofa5yearold:" yeah, ive tried sitting and talking with her, it always seems to make it worse =/ idk if its how im comming about it, or what"
How are you going about it? Are you approaching her calmly (even if she's screaming at you) and being understanding.
Little things are a big deal to little kids. I went through this with my 3 year old while I was pregnant. When she'd act out we'd talk about what was wrong, talk about the baby and how they'll be best friends, etc.