After assisting Zahara, 17, with settling in at Spelman College in Atlanta,

Georgia, Angelina Jolie, 47, is now back in Los Angeles. According to sources,

her children, Maddox, 21, Pax, 18, Shiloh, 16, and twins Vivienne and Knox, 14, are "stepping up" to support her as she adjusts to the major change.

has been difficult for Angelina to send Zahara off to college, but fortunately her children

have been helping to make sure she doesn't get too upset about it, according to an insider.

 Even though they are all teenagers now, they are all so tuned in to their mother that they can tell when she needs additional

How Angelina Jolie's children are supporting her as she adjusts to Zahara, 17, leaving for college