My First Love and Other Disasters — Francine Pascal

It's not easy to be fifteen and in love -- especially if the boy you love is seventeen, gorgeous, and doesn't even know you exist! Victoria is determined to be a mother's helper on Fire Island, where Jim will be spending the summer. So what if he's got a girl friend back in the city. Anything can happen. Victoria finds herself overburdened with two small children and endless household chores, but she's sure it's worth it because Jim not only notices her -- he likes her! And yet, if this is her dream come true, why isn't she happy?