Nicole Kidman is in a "good headspace" amid her divorce from Keith Urban, but there's been some challenges, a source exclusively tells Us Weekly. "The hardest part is navigating the dynamic with their daughters," the insider says, referring to Kidman and Urban's two girls, Sunday Rose, 17, and Faith Margaret, 14. "The last thing Nicole wanted was a broken family," the source explains, noting that the actress, 58, "raised her daughters to be strong and is leading by example for them.