training not to potty on deck

13.5 weeks old lab here. i wanna say she is potty trained but dont wanna jinx it. 2 weeks accident free so far. but since it is getting warmer up her in canada, we finally see our deck again, but she keeps peeing and pooping on the deck when we are outside in the backyard, how do i tell her not to potty on the deck? her usual potty spot is at the front near the porch.