Aw, she's precious, Legend!
I know you're busy, but if you try to pay a little extra attention to your older one, it will help. Everyone is carrying on about the new baby, and she feels left out.
If she's old enough to understand, stress to her how lucky the baby is to have a big sister like her, and how proud you are of the things she can do that the baby cannot. She needs to feel that she's important too.
We get by with a little help from our friends