2.5 year old and newborn

So my 2 year old will be 2.5 when her sister is born at the end of July. Ive decided that her meeting her baby sister in the hospital is not ideal as she is a mamas girl and going through some separation anxiety at the moment not to mention elevators and doctors freak her out...its just a disaster waiting to happen and Id rather do it where shes most comfortable (home). She loves babies but, I worry about the time a newborn requires and jealousy rising. Im wondering what I can do to help her if that issue should come up. I dont think a gift from her little sister will help...I think shes too young to appreciate it and find it cool. I want to breast feed / pump but I know thats a lot of time in and of itself. How do I help my little girl adjust? what should I expect? Id hate to see her little face sad. I plan to let her be as involved as she would like. Any advice and help would be so appreciated!