Frozen meals on the plane, a microwave in your room, eating off some kind of portable plates — boy, I cannot think of anything less festive. Or less like bountiful South Carolina Thanksgiving dinners. And then you have to wash up the plates and things in your shallow bathroom sink ... ugh. It's like seedy motel living. The frozen and thawed entrees are not going to be particularly yummy. And that's even if you don't get food poisoning from things thawing too soon.
My advice is not to be silly. You're paying a lot of money to fly down to Miami. It's penny-wise but pound-foolish to get there, after all that expense, and try to do some inconvenient cheap not very tasty dinner in your hotel room. It's not very festive for your mother, either. If you're trying to give her a memorable time to think back on, I'd suggest a good memorable time is better than a time of how extremely cheap you can be. Even, perhaps, of how you didn't care about her Thanksgiving enough to let her go to a restaurant.
I suspect that if you tried to import all this frozen food, she'd just insist that you'd go to a restaurant. (That's what I, as a mother, would do.) Then you'll be frustrated about what to do with all this food and how you spent so much trouble packing it and all, and you'll disagree, and that won't be very festive either.
Read some online reviews and pick a good restaurant. The hotel restaurant will probably be fine. Advantage: no long hours of cooking, no having to wash everything afterwards. These are advantages that mothers especially appreciate.
And if you each spend $75 on the meal — that"s $150. So what? Presumably if you wanted to pinch pennies to the utmost degree, you wouldn't have decided to go on this trip on the first place, right? So just do what's right and let your mother have a nice restaurant Thanksgiving meal.
