Puppy Training Q&As

I just rescued a 2 year old Cocker and she has been peeing in the house. I have since gotten a crate for night cause that is when she has be doing her business. What I want to know is when I take her out to pee and poop is it right or wrong to give her a treat for going outside? My friend said it is very wrong for giving her the treat as it says when you pee you get a treat so she pees in the she thinking she will get a treat. Thanks soo much for helping me. I have a 13 y/o JRT that I give...