I agree to. I also suggest that after dinner at Chef Mickey’s you go straight back to the resort and get a good night’s sleep. WDW can be an exhausting place!
I’m assuming that your CP adr is already in place - unless you can change it to Sunday - and you have to go on Saturday, I’d say, just stay at the MK. If you have to take a bus first thing to MK for breakfast and then after breakfast travel over to MGM, you’re going to waste a good hour of touring time. (I hope you kinda understand what I mean). You’ll be getting a good, early start at the MK, so I’d head straight to Fantasyland, doing Winnie the Pooh first, then Dumbo - while waiting in line for Dumbo, one of you can run over to Peter Pan for a fastpass. After Dumbo - if it’s time, do Peter Pan - if not, first visit Ariel, then do PP and then Mickey’s Philharmagic. It’s a Small World can be fitted in after that, because it’s generally very fast loading. You must decide with your goddaughter’s mother whether she’s up for Snow White’s Scary Adventure - it can be a little too much for a 4 year old. After that let her play in Pooh’s Thoughtful Spot for a while - while you rest. A ride on the caroussel is fun too. And that should take care of Fantasyland. By this time it’s should be time for lunch. Pecos Bill’s in Frontier Land is good, as mentioned above. After lunch she might enjoy Aladdin’s Magic Carpet Ride in Adventureland. Check to see how long the line is for the Jungle Cruise. If it’s more than 20 minutes, get a fast pass. While you’re waiting you can do Country Bear’s Jamboree or the Tiki Birds. After Jungle Cruise, you can do Pirates of the Carribbean. Walk over to Frontierland and catch the train. You can either get off at the stop in Toon Town to look around at Minnie and Mickey’s houses, or ride to the front of the park. For a 4 year old little girl - that’s a pretty full day at the MK.
I’d do Prime Time Cafe at MGM for dinner, simple, good comfort food and it can be fun if you play along with “mom” - and let her play for a while at the Honey I Shrunk the Kids playground.
I know this is probably more advice than you asked for, but I’m feeling chatty today…