Daisy was created by Michael Oeming and Scott Kolins. She first appeared in 2007's Omega Flight #1, although she didn't make a full-fledged appearance and introduction until issue #2.
Her origin, if any, has yet to be explored.
Major Story Arcs
Alpha to Omega
Daisy was first seen on the security footage of a bank that she'd robbed in Nova Scotia after she'd crossed into Canada in order to escape America's Superhuman Registration Act. Crimes like this caught the attention of S.H.I.E.L.D. and led to the Initiative moving to have a new Omega Flight team established.
She made her way to Toronto where she began wiping credit databases in order to wipe her own credit. U.S. Agent was sent to stop her and the two became embroiled in a fierce battle. Daisy hurled U.S. Agent into a building and leapt after him, but U.S. Agent retaliated and sent them both falling to the ground. Smashing into a truck below, they continued their fight until some bystanders remarked that Captain America was hitting a girl, briefly distracting U.S. Agent. Daisy took advantage of this, decking U.S. Agent and prepared to crush him with the truck they'd wrecked. Arachne stepped in then however and webbed up Daisy's hands, causing the truck to fall and knock herself out.
Daisy was presumably taken into custody afterwards.
Powers & Abilities
Daisy possesses superhuman strength and durability, the limits of which have yet to be defined. She was shown to have more than enough strength to rip a safe open with one hand, as well as lift a truck over her head. Her durability was shown to be high enough to withstand blows from the super-humanly strong U.S. Agent, as well as surviving a fall from several stories high.
She has no true combat training but is a very vicious and capable street fighter.