You might want to mention (or provide for important members) these amazing plastic heel protectors, that make it really easy to walk on grass for those that wanna wear heels
Have you asked the bride if she has a preference for color or style?
Since outside, I'd say nude wedges, block heels, or open-toed heels with those grass things on the bottom (https://www.amazon.com/GoGoHeel-STOPPERS-Heel-Protectors-Sinking/dp/B01KGFOTMS).
First World problems require First World solutions.
I’m betting it was an outdoor wedding. These go on the bottom of high heels so you don’t sink in the grass.
https://www.amazon.com/GoGoHeel-STOPPERS-Heel-Protectors-Sinking/dp/B01KGFOTMS
You can always try using heel protectors if you go with a slimmer heel: https://www.amazon.com/GoGoHeel-STOPPERS-Heel-Protectors-Sinking/dp/B01KGFOTMS
I found my shoes on amazon: https://www.amazon.com/gp/aw/d/B07Q578B9Z
This brand, InterestPrint, is surprisingly comfy support on the sole-almost like Neutralizers.
Also try checking DSW, JC Pennys, and Macy's for more formal shoes.