How do i beat screaming mantis with non-lethal?

You cant, the only weapon you can use is the Mantis Doll.

Beat her by using her dolls. It's already include non lethal.

To beat screaming mantis using non leathal means you have to use the tranq gun to shoot the dolls out of her hands if you have the solar gun that would help if you have already gone thru the game and gotten it but if not then use the monsin nagant tranq rifle to get a bead on her dolls from far away make sure you have the syringe equiped so she cant lock onto you with the dolls herself then once you have the dolls use the mantis doll on her and then get the statue after shes beauty form then use the tranq gun on her also between shooting the dolls out of her hands make sure you tranq meryl so that mantis cant use her agianst you

I pretty much use the saga12 with the v-ring ammo on everyone