Belinda starts at cr 2 already , on par with premium units. Besides that , shes the spica of witches , and she will help u pass wall of magic (which requires very cheap witches/witches with range increase - at least level 2 of belinda's skill)
You could have easily tried to get another coppy at least for the guaranteed cr/su.
I seriously disagree with your decision here. Belinda is the best witch avaible to freemiums , and the 3rd best in the game after adele and despara. And the reason why adele is better is because her AW bonus affects all units , not just witches. Other then that , i actually preffer witches with range increase , rather then damage increase like adele is