A few thoughts:
1) Babies change their routine as soon as you feel like you've figured it out, so there's no reason to think that she'll eat the same as she does now.
2) It would clearly be easier if she ate something shelf-stable (jarred or pouches), and I wouldn't necessarily stop trying.
3) It is entirely possible to fly with frozen food. Contact your airline for guidelines on what they'd prefer you do. I don't think carryon is a good option because of TSA requirements regarding ice packs. You run the risk that your food gets lost enroute by checking it, but you can always go to plan B if you need to. Once you know what type of container you need to use for your airline, put your homemade food in pouches or however you plan to transport it, and surround them with high quality ice packs (like they use commercially to ship frozen food, not like they sell for keeping sandwiches cold). Ideally, your food will be surrounded on all four sides with ice packs. Put them in the cooler with your food while NOT frozen, then throw the entire cooler into your freezer if at all possible - this way, the ice packs mold to a shape that fits. If you can't fit the cooler into your freezer, it's not a huge issue - that's just how I prefer it. (I've only ever driven with lots of frozen purees, never flown, but the principle is the same.)
4) To me, a bigger problem than actually transporting it via airplane, is: a) do you have a freezer at your hotel? b) do you have a way to keep the food cool all day in the park? If you have a freezer at the hotel, a small lunchbag and lunchbag ice pack will work for the park. If you use those food pouches they sell for baby food, those will defrost in the fridge in about a day, then should be used within 24 hours, which you probably already know.
(I have never transported homemade baby food, FYI. My now-toddler has been on a whole foods blended diet through his feeding tube since we transitioned him away from pumped breastmilk after he turned 1. So that's what I have experience with, but it's basically the same thing. Pureed food.)