There are about two thousand people in range, assuming the Siberian didn't quit chasing her early to disguise it. Drones will have a hard time narrowing it down and will definitely attract attention.

She can do some Thinkering on the problem while waiting for Jack and company to come out and play.

The Genesis link suggests the cape doesn't necessarily look like the projection, she probably wasn't faking about the distance, and here come the Nine.

The more thinker capes she has out the less prepared she can be for knife beams etc., though most of the cetera are distracted by the swarm of robots.

That is their purpose. She's got enough of variety to be able to stay alive long enough to shift to a more offensive configuration.

"Nice to see you again too, Jack. How was New York?"

"Same as always, unfortunately.

The drones are a nice touch, but you have to realize you're outmatched." A glass spike as big as she is crashes against her back. Still no visible sign of Shatterbird.

"Of course I am. Do you really think that's the sort of concern that would stop me? I'm not here to kill your henchmen, Jack. Just you."

She focuses on wide-area attacks, trying for as much collateral damage as possible. She probably should have come up with a way to stop the Siberian Siberianing before now, it's not like Jack is going to let go.

It's going to take a lot of collateral damage to kill the two thousand nearest people. If she's just trying to flush out Shatterbird, her drone collective can get to it first. The shards of glass are under more fine control when higher up, and any drones that get too high get crushed or at least knocked downward. They can pick out a general direction, which is mostly up.

She flies one of her bodies to go look.

Shatterbird pelts her and flees. It's just physical projectiles, nothing she can't shrug off.

She pursues, close enough to talk, not close enough to touch.

"Are you interested in fighting Scion at the end of the world?"

Shatterbird is fast. Ellie is also fast. 

"You're trying to end the world? That's new."

"Not me. Him. He's not human, not even parahuman. He's an alien, and somewhere between two to thirty years from now, he's going to get tired of rescuing kittens from trees, and it will be us against him."

"Congratulations, you now sound marginally less crazy."

"I talked with a group who thinks you might be useful in that. They asked me not to kill you. If you go now and leave Jack to me, I won't come after you, now or later. If you find the Siberian's real body and take that with you too, we'll call that me owing you a favor."

"If I were scared enough for inventive threats to work, I'd run. Thanks for the tip about the Siberian being fake; Jack will be pleased to find out I know and didn't try to kill her at all."

"Seems to me running is exactly what you've been doing."

She closes the gap.

"Seems that way, doesn't it. It wasn't."

Tiny particles of glass flow around Ellie's face, sliding their way into her nose and forcing her mouth open. They're rounded, or something; they really should be hurting despite the brute powers otherwise. As soon as they've wormed their way some distance down her throat they merge into a solid object, and now running is what Shatterbird is doing.

Bodies merge, then split, leaving the glass behind.

A forcefield appears in Shatterbird's path that will bounce her off, sapping kinetic energy. And then another shade will increase her inertia considerably as Ellie catches up.

Stuck at short range, she tries the glass powder trick again. Nose, mouth, even eyes. This time she didn't round the edges first.

She switches to a metal body, and grapples.

Shatterbird's eyes go wide. Then she stops.

"Okay. You got contact and I'm still alive. You've made your point."

"My previous offer stands. Are you going to avail yourself of it?"

She stops and thinks, and looks downward.

"All right. I'll come back when the others have finished with you."

"Don't hold your breath."

She releases Shatterbird and returns to the main fight, switching out of the metal body. More of a hinderance than a help, against Jack.

The others saw when this body disappeared, and noticed when she turned metal. When she turns back, Cherish is going full force. Knowing that the hopeless dread and urge to kill herself are being induced by an enemy doesn't actually make it easier to disregard.