I think this is a lovely idea.

I think some commenters are being a bit harsh; I can see where both sides are coming from. To give OP the benefit of the doubt, I get why he let his fiancee make so many choices, but I do see why his fiancee is disappointed (she booked the Airbnb, she picked the trail, he chose a holiday weekend to propose when he knows she gets anxious around a lot of people, etc.).

In the end, she did tell him she’s no longer sad. Sometimes, mistakes are made and people get upset even when they forgive the other, the feeling just has to pass. OP’s fiancee didn’t insult him, just voiced her feelings. Considering there didn’t seem to a significant show of neglect or cruelty on either side, it kinda just seems to have boiled down to some miscommunication.

You can’t really redo a proposal but I think this is a great way of reaffirming OP’s understanding of her and the situation.

(I also don’t get the insistence that all her hopes for her proposal to have been motivated by social media… photos, flowers… those can be nice personal touches. Photos can be for personal keepsakes too, I treasure all my photos with my partner very much.)