Credits and deductions

I am in exactly the same situation. My children are 10,15, and 16. My wife used to receive CCTB (or UCCB? or both?), but that stopped 4 years ago when my daughter turned 7 (I think). Will my wife automatically get the new UCCB after this 4 year gap? Or does she need to re-apply? I cannot seem to find an answer to this.