Pinky and Rex the New Baby: Ready-to-Read Level 3 in Bloomington, MN

Rex's parents are adopting a baby, and Rex doesn't like the idea at all. Suppose her parents are so busy with the new baby they forget about her?
So she comes up with a plan. If she can be the perfect big sister, her parents will
have
to pay attention to her. The trouble is, being the perfect big sister is a lot of work, and it doesn't leave time for much else — like her best friend, Pinky.