"It's A Mira-cle" is the thirteenth episode of Season 4.
Synopsis[]
While Bonnie, Jonathan, Vera and Harry are on a double date to an open mic night in Boston, they become fascinated by one of the performers, a Chicago transplant named Mira Sydney, who appears to be able to do anything with her voice. She seems like the perfect replacement for Jillian, and while Vera is ready to hire her on the spot, Jonathan seems to think Jillian is better health-wise than she actually is and does not want to hire Mira only to let her go when Jillian is able to return. When Harry suggests that perhaps an additional teacher in the department would lessen Jillian's workload (and thus her stress level) when she returns, Jonathan finally agrees to the acquisition. Meanwhile, on the eve of Annie's second birthday, Jason attempts to get back at Maya for asking him to leave the production of "Free To Be You And Me" by getting the toddler obsessed with "Frozen."