“She was hit by another driver in Chicago. She is doing fine and will be discharged from the hospital shortly,” a source tells PEOPLE.
Cavallari, 29, and her NFL quarterback husband Jay Cutler welcomed their third child, daughter Saylor, Nov. 23.
The accident follows a difficult few months for the family, with Cavallari’s brother Michael discovered dead Dec. 10 nearly two weeks after going missing in Utah.
In a New Year’s Instagram post, she reflected on the highs and lows of the last few months.
“2015 brought my sweet, baby girl but it also took my brother’s life. Hoping for no extreme highs and lows this year. Happy new year, everyone.”