My dog thinks she’s too smart for recall

So my dog just turned 3. She’s a large mixed breed that is sometimes too smart for her own good. When we first adopted her we went through proper training and she really is quite intelligent, she picks things up quickly, she remembers tricks even if we haven’t done it for a while, over all she’s a really good dog. The problem we have is with recall. She knows that I almost never have anything more interesting than whatever she has found. She’s never been particularly food or toy motivated so having something she wants is difficult and if I don’t have something interesting, she’s not going to do the thing, even when she knows exactly what she’s meant to do. Which is totally logical, why would she leave something interesting that she’s sniffing if I don’t have something better? But it’s a problem. When we’re at home or she’s done with whatever she found her recall is immediate, every single time. I’m her preferred human, I intentional always have snacks or play time or something positive whenever I call her at home, it’s just that nothing seems sufficient when outside. Do I have to just accept I’ll never be able to let her off lead outside fenced in yards?