Where The Grass is Green And The Girls Are Pretty by Laura Weisberger

Two sisters with very different backgrounds deal with a bad situation and learn a bit about themselves in the process. Peyton is very successful Morning talk show host with a great husband and teen daughter who is leaving the nest for college. Skye is super mom working on every committee, room mom, Girl Scout Leader and about to open a house for underprivileged city girls once she has the last bit of funding. She is also happily married and has a precocious daughter and supportive of her niece.
Peyton does the unthinkable and pays a bribe to get her daughter into Princeton. Her husband takes the fall to keep Peyton's career intact but soon it along with her marriage is in free fall. Skye is keeping a secret or two of her own. A summer of discovery, complicated family relationships and a madcap romp to fix what she broke - this story will resonate with fans of her other books and WHERE 'D YOU GO BERNADETTE.  4 stars