And she sets about settling into Ponyville.
She learns her way around - here's where she can buy carrots and bunched dandelions and clover sprouts; here's where she can get a case for her crown and cases for everpony else's necklace so they don't have to wear them or leave them lying around loose; here's a shortcut between Guiding's house and the tower the twins live in together. This is when this little town wakes up in the morning and this is when everything closes at night. This is what her friends do all day: Cherry Cordial farms and looks after critters. Brightblaze tinkers with gadgets kind of singlemindedly (though she also flies). Silver Streak plays violin and and reads and wanders around looking at things. Guiding Star does fortune-telling for spare bits and belongs to a dance group and volunteers for anything going on in town that could use amateur decorating (Joy is often with her when she does this). Joy also wanders around being sociable and helpful and cooks, itinerantly, for anypony who'll spare him kitchen space.
And Clarity learns the organizational system of the library, with Blueberry's considerable help, and she studies and explores.
And when she's been in residence for just shy of a week, she gets a letter from the Princess, which contains six tickets to the Grand Galloping Gala. Aww, that's thoughtful. Clarity's never been before.
She goes out to see which of her friends she'll run into first if she takes a meandering path through town.
"She is very unusual, yes. I'm sometimes surprised that she does not yet have her cutie mark."
"At the same time as my sister. She was testing her first set of flight boots and accidentally created a sonic rainboom. I observed the direction and distance and immediately realized she must have done it, even though I hadn't known she was working on anything at the time."
"And a sonic rainboom is what scared Cordy's squirrels. Interesting coincidence, isn't it?"
"Rather. Maybe lots of ponies were sort of - prompted by it. It was sort of relevantly inspiring; I was trying to do the magical equivalent of brute forcing my final exam and then it sort of reminded me that magic can just interact physically with the world."
She smiles. "It's possible that it prompted a lot of ponies. But I think I'd want to know why, if that turned out to be true."
"Yeah, it's not a known feature of rainbooms, or if it is, it's not documented well enough for me to have found it when I looked them up after the event."
"So, effectively, not known to you. Hmm. I can't readily think of any explanations," she says. "That doesn't happen often."
"I suppose that, technically speaking, sonic rainbooms are rarer than me not being able to think of an explanation for something."
"Wouldn't it be funny if Guiding got hers the same way? I guess Joy would be left out anyway, though."
Clarity has figured out where they are at this point, and does know the way to Guiding Star's house. There she trots.
"Looks like everybody's set up to be on time and remember all their gear, but I'm not gonna tell you who's going to win, that'd be no fun," Guiding tells her customer, who giggles and tosses her a few bits and gallops off.
"Hi, Streak, hi, Clarity!"
"Hello," says Streak. "I've just been given cause to wonder how you got your cutie mark."
"Huh, did I never tell you? I was messing around with magic and then I had my first vision and I knew something cool was going to happen, so I ran to tell everypony to go out and see it! And they did, and I had my star."