Hi, Zulma! With your toddler granddaughter, you have many, many options at WDW. If I could pick just one park to visit, I would suggest the Magic Kingdom. There is much to see and do for even the youngest visitors. It's at least a day-long event...so you'll have to be on board with making a day of it (especially if you're not staying at a Disney resort). If you purchase Magic Your Way tickets, you have the option of visiting all four of the parks on several days of your week-long stay. (Since she is under 3, her admission is free!)
Throughout WDW, there is much to see and do outside the parks. You can take her to Downtown Disney for some fantastic dining, shopping and entertainment. And at that age, my little ones loved Disney transportation -- buses, boats and the monorail. We have spent much time going from resort to resort on Disney transportation. Some other areas that we love to visit are The Boardwalk and Fort Wilderness. Wagon rides, ponies and Chip n' Dale's Campfire Sing-A-Longs are big hits at the Fort!
If you happen to have your own transportation, it's so much fun to travel throughout the WDW property in search of great
dining and
recreation choices -- playgrounds, rental boats, arcades, mini-golf, kids programs and bike rentals are just some of the fun activities you can enjoy together throughout WDW. I hope this helps you plan your time with your granddaughter. Have a wonderful day and a magical trip together!