Did your vet not give an indication as to how gradual she meant? I think I would contact her and ask her advice. You don't want Luna to start having problems again. Gracie might have a suggestion based on how she handled this aspect with Atticus.
I've often bought the VetCare Digestive Health Formula for my rabbits. In my view they are extremely similar to FibaFirst in shape and ingredients, but are not quite as crumbly. One of my rabbits prefers the tast of the VetCare one to FibaFirst, which is why I sometimes get it.
If you're not sure I'd agree to contact your vet, also agree with Omi about the vet care sticks
I actually bought them for Atticus after I think MightyMax and my vet suggested them, but they made him worse unfortunately - Clementine ate them though so all was good [emoji38]
What I did was literally a couple of pellets a day as a treat, whenever I saw him - and slowly built it up til maybe he was getting 10 pellets a day? If it messed with him I reduced the amount again - he's now on half an egg cup a day roughly I give a bowl with an egg cup in to Atticus and Clementine and they just eat about half each now
but I think I gave him two pellets the first time he had them again and kept that up for a week before I gave more (Idk if I was over cautious, he was just so so ill and I wanted him to be able to tolerate a few a day if nothing else just so he was getting a good diet) I did the same with veggies eventually, I never thought he'd be able to eat veg again, but he manages broccoli, kale, spinach, watercress, rocket and a few different herbs everyday without it upsetting him now
just took months to get there, I felt very guilty for a while 'depriving' him of veg, but he went a few months without it and then we were able to build back up to it.
I wish I knew what was really wrong with Atticus like I'm sure you do with Luna
it's one of those things which is hard to figure out and test for, so managing it is as far as I've got honestly x
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