Getting a dog to come in from outside playtime.

While you're working with her, I'd only let her outside on leash. She can drag it, but never take it off. This way you can enforce your come when called if she'd rather keep playing by taking the leash and leading her back. All the trainers I've worked with emphasize that since a solid come when called is SO important to a dog's training and safety, you should never use the come command unless you'd be willing to bet $50 on your dog listening perfectly the first time. If you wouldn't take that bet, don't use the word. You can dance around and make happy noises, or you can just go grab the leash and lead her away, but do not use the word unless you're SURE it will work, since off-leash or at a distance, you can't immediately enforce it.

Then on leash in your yard, start back at the beginning. Hold the leash, ask her to sit, take a step away, and ask her to come. Be exciting and interesting and make her want to come to you. Reward heavily with food, play, praise, or whatever she loves. For a dog who just wants to keep running around in the yard, give her her favorite treat, some praise, and then release her to keep playing as soon as she completes the task. If she realizes that come doesn't always mean the fun stops, she'll be a lot more willing to comply. Gradually increase the distance and level of distraction, and keep rewarding. Outside, you need to be able to compete with a squirrel circus, dudes passing out free steaks, or whatever other craziness that would be the BEST THING EVER to your dog. As she gets better and you can reliably call her over greater distances and with more distractions, you can give her progressively more freedom to roam, but still, don't use the come command unless you're sure she'll listen, because you don't want her getting the idea that come is ever optional.