Thank you everyone for your responses!
I did email Universal's Food Services team and they were full of helpful tips and recommendations. I also took some time to look at more TRs and reviews here on the Disboards and across the internet and have learned a lot in a short time!
I wasn't sure about the Mama Della's reservation we originally had, as I'm travelling with my DBFF (its our 25th friend-iversary!

) who has recently had to cut her sugar intake who specifically wanted to go there for tiramisu so I went ahead and cancelled it. I replaced it with a reservation at The Kitchen, and also made reservations at Mythos, Confisco Grille, and Lombard's Seafood Grille (she may not be down for sugar but my bestie loooooooves seafood!) I have seen many of recommendations for these locations and will be sure to report back on my findings!
Other than those sit-down table services spots, we plan to eat at Wizarding World locations the Leaky Cauldron and Three Broomsticks (especially as I know Butterbeer is gluten free

), Thunder Falls Terrace, and I will probably try the baked potatoes available at some of the kiosks around UO (as long as they are still available of course.)
We do also have a grocery stop planned on the way to resort (we are using Tony Hind's service to and from the airport) so that will give me a chance to stock up on snacks and other options just in case they are needed.
I am soooooo excited for this trip and the encouragement and resources I've found thanks to all of you have been wonderful!

Thanks again!