TY for answering my questions! Rosie sounds like such a fun kid to hang out with.
1. Ohohoho, a spoilery question right off the bat lmao; Imma put my answer in spoiler text:
Yes, Zelda will face some good ol' tragedy; shit will hit the fan for her in the final part of her story (A Sort of Tender Curiosity is split into three parts/acts btw)
2. Hmm, generally, Margarita does not know that Zelda exists (yet).
3. Like her inspiration, there's more to Margarita than what's on the surface and while I may not indulge that since that's one big spoiler, I'll go copy-paste a couple sections of her ArtFight bio lol:
"She's old money, being the youngest daughter of a billionaire who runs a big tech company that's been passed down the generations. She's also a popular online influencer, having millions of followers across several social media platforms. Margarita would occasionally host parties and events for various reasons, such as celebrating achievements her family's company made and supporting communities. Margarita is shown to be affable, polite and gentle. She smiles often and speaks in a soft, cheerful manner."