Not if she's close enough to it! (The sheet of opaque plastic does not join her in starscape, relevantly.)

So it is just a range limit with 'sight' as a metaphor. If the thread is clipped, the objects disappear instantly? Is there a faint 'pop' (suggesting inrushing air to fill the vacuum) or a soundlessness (suggesting the air was transmuted into the object instead of the object being created ex nihilo?)

Yes and there is a faint pop.

All right, moving on for the moment: What level of detail can she create at? How about something with very simple fractal pattern; how far do the tiny patterns repeat? He has a microscope if necessary.

The patterns repeat very small but not so small you need a microscope; a magnifying glass of the kind some gigantic dictionaries have will do.

Can she make them repeat even smaller if she has a magnifying glass?

No, but she can do eagle-eyes and then get them smaller!

"... Fascinating."

Her shapeshifting is SO COOL and he strongly suspects she knows he thinks that, but, well, it is SO COOL

"Thanks."

While they're on object creation... how large an object can she create? They are limited by the size of the room, though it's a fairly large basement, and if they have to they can go out into the street.

This again seems to be a zoom in starscape issue, but she can fill her starscape visual radius with a beanbag or whatever.

... He's going to try something ridiculous and not tell her he's doing it. Specifically, he wants to know if she can make this specific very simple circuit design, it's built into a bracelet and a piece of equipment that disables people's powers? Connected by a thread, please?

"Uh, sure, if I can get a good look at it -" If it's very simple she can probably do it, and it seems likely that it won't work on her powers since hers are different.

It's very simple, so she can do it! And it won't work on her at all, not if she's from another universe.

"Like this?" she asks when she's got it.

That looks exactly correct and does nothing at all, the tiny light doesn't even go on.

"You do not have hidden tinker powers," he says.

"Drat."

"I didn't think it was likely, but -" he shrugs. "Worth testing." 

"Yeah, that's legit if it comes up sometimes."

"We didn't even know that tinkers weren't just 'good engineers' until the seventies, and subtle tinkers can still sometimes be very hard to spot."

He pauses, noticing something he'd missed earlier. "... You called your - shapeshifting alternate view - a starscape? Would you mind expanding on that?"

"Oh, uh, the background I see myself against is of stars, it's like that for all of us. It's consistent stars per person but doesn't match identically between people, but I'm not sure if some people match, or if the starscapes could potentially be, like, summer or winter constellations of the same place, or what - they aren't the stars as seen from Earth."

"Do you see the same stars here as on your own world?"

"Yeah, I can recognize my usual constellations here."

He's running out of shapeshifting and costuming tests. A few more ones worth trying before they move on to frame-of-reference, which is going to be the hardest part:

- If she shapeshifts into other superheroes, can she copy their powers? (Almost certainly not, but there's three mimics and might be four.)

- What does her flying speed look like? Has she tested alternate wing designs for faster flying speed, or was she not optimizing there?

- Can she change her voice via shapeshifting? Is perfect pitch shapeshiftable into having? (He has no idea and is really just curious.)

She wants to take a picture of her current face and outfit first but then she'll try anyone who isn't shaped too close to or far from baseline. Doesn't work.

She can do around fifty miles an hour but competitive fliers are much faster. The prettiness metric punishes plagiarism so copying wing shapes exactly is best left for athletes who aren't going for magic performance.

She can't do that because she can't see her vocal cords.