Do you think she actually arranges any of this herself? Or does her mother play manager and do all the logistical stuff while Ruby just shows up and twirls in free clothes? What is the role of her management company? Do they set up this stuff? I find it so hard to believe that Ruby has a head for any sort of planning or relationship-building.
A lot of it will be Ruby, but there's almost no work required from her beyond sending emails highlighting her follower numbers and social media reach and asking if they'd be interested in a short social media partnership.
Half of her brand deals are arranged by her management team, with things like the BBC iPlayer, NordVPAnne, Netflix sponsorships, etc, they're regular brand partnerships that Sixteenth have which they have all their "talent" take part in.
Eve Cornwell and Holly Gabrielle wave all the same snack bars around as well, and all the same sponsorships pop up with all the Sixteenth influencers (and they're all follow the same tactic of hardly ever declaring them, so Sixteenth are clearly giving the nod to just be dishonest and skirt the rules). Ruby likely just gets sent a schedule of brands she needs to plug in a given month and in what form.
With things like the Ammily Dickinsun Museum, she likely arranged it herself, but I don't think it was complicated or hard, and there was very little planning involved. She's had nothing but time to draft emails with brand deal enquiries since she does nothing else with her time, and her manager likely helps plan her general brand schedule.
She would've just reached out via their volunteering email address, leveraged her following and fanbase and said, "Hallo, it's Ryoobee and oiy will be cyomming tyoo AMMARICKA syoon and would VARRY MOCH lyove tyoo wahhrk with you whoile oiy'm thaaahr. I have SYO SYO MANNY followers which could bring a lyot of awahhhrnass tyo the museum and AMILLY DICKINSUN is moiy MYOST FAVOURITE WROYTAH AVVAH (boht please dyon't ask me whoiy because it's VARRY PARRSONAL and this is nyot the roight toiyme or mediom). Oiy could even GHAST PYOST on yore syocial media!"
Her follower numbers did the heavy lifting for her. The museum likely saw an influencer with a large follower count, took her fake quaint and bookish persona at face value, and saw it as a decent PR opportunity for the cost of a couple of free tours when the museum was closed to visitors anyway.
With places like Mispah TEENAH or BARD 'N' BLAND, she will have had a longstanding marketing contact at each company whose ass she's been kissing for years and buying goodwill with by posting undeclared ads for them, so she already had an in to ask about vanity brand deals.
She'll no doubt paint it all as tireless work and entrepreneurial girlboss planning, but in reality it's almost certainly just been nothing more than a few query emails sent during her year of doing fuck all.