~ Check her likes and dislikes in the details screen. If it says she likes "running", then it's not a glitch.
~ Make use of her running attribute while you can (she can get a lot of building done too), because she will start to slow down as she becomes older and elderly (specific age will differ depending on what health level tech you have).
~ Unfortunately, likes and dislikes do not appear to be genetic; in other words, I tried breeding one runner with another runner, and their child was not a runner.