Returned

Struggling to discover her role in a terrifying new world where everything has changed, she must decide who she can trust.
Sierra Walker has been missing for 30 years. Her family thought she was dead, only when Sierra turns up, she hasn't aged a day. But Earth has changed drastically.
Biological warfare has decimated the planet. Her home town of Redmeadows exists under a bio dome, and to survive in Redmeadows, you must be micro-chipped. No chip? Then it's off to quarantine for you. And no-one has returned from quarantine. Ever.
Running from the law, fighting her forbidden attraction to Alrik, the tall, dark and handsome alien who rescued her, unsure of where her brothers' loyalties lay, and mourning the death of her mother, can Sierra also keep the secret she's been desperately trying to hide? The one that could be her salvation or her doom.
A note to readers: Returned was previously released under the author name Jane Hinchey.