frustrating part, is that i had a GOOD coat of carnuba wax on her. it should never have gotten to the paint.
Carnuaba is not going to protect against bird poop. If the temps have been above 90F, that carnuaba is going to burn off in 3 or 4 days. A good poly sealer under the carnuba will help protect against bird poop better, but leave bird poop on any car finish, and it will etch the paint. It does not matter if it is lacquer or urethane or even ceramic, it will etch if you leave it on there long enough.
Best you can do is get the shine back, but if it was on there very long, the shine will still have a 'puddled' look from where the etching went into the paint and was removed to restore the shine.
Start with Meguiars Swirl remover. It is a soft abrasive which will help remove the etching. This should get the shine back.
I like Wolfgangs poly sealer and finisher. The "finisher" removes micro-swirls and restores lubricity to the paint. The "sealer" will last about 6 months, on good paint and is easy to apply and remove. All Wolfgangs products are water based, so they will not harm the paint like Meguiars Cleaner Wax will.
I also like to clay the surface before applying the sealer/finisher. It gets rid of contaminants washing will leave behind.
Once you get the poly sealer on it, put a coat of a good carnuba on that and you will have done everything possible to protect the paint.