As per the Marvel database - Anastasia 'Stasi' Inyushin was a Russian girl with the paranormal ability to make plants grow. She was being tested by the KGB at the facility known as the Siberian Project when the so-called White Event boosted her powers to an incredible degree, giving her the power to heal seemingly any illness or injury in any living thing. Rescued and brought to America by Emmett Proudhawk, Stasi became a member of Psi-Force, the quintet of youths with paranormal powers that Proudhawk had gathered together out of a desire to protect them. The gentle, duty and loyalty driven Stasi remained with the group, her surrogate family, following Proudhawk's death.
Instead of Anastasia being tested by the KGB as per the comics, this character has been adapted from further back, being born in 1920 to a poor family on the outskirts of a little farming village outside Moscow. Once word got around about a 13 year old girl with a healing touch, the Soviet Army was ordered to kidnap her. Her parents were killed in front of her by execution and fire when they attempted to protect their child. She was immediately brought to Johann Schmidt in Germany who adopted her and had her schooled as a child militant; being trained in arms weaponry and self defence tactics, along with being tested and coached in the attempt to strengthen her abilities and apply them to the human body. While living with Schmidt he treated Anastasia like a daughter; emotionally and mentally manipulating her into accepting him as a father figure. However, when her training and study reached its peak, he sent her to a top secret HYDRA base to undergo deeper and more intensive experimentation in the hopes that her power could be used to extend Schmidt’s life indefinitely and make him more powerful, as well as engineering her healing skill to be used in reverse to kill enemy combatants.
Her ability began with being able to bring dying plants back to life and through some further testing and training she could apply it to regeneration of the human body on a cellular level. When she was transferred to HYDRA, the organization wanted more from her, and began further and more invasive testing with electrotherapy, brainwashing, and torturous injections to see if she could apply cellular damage as well; in short killing people with her touch. Their ultimate plan was to advance their experimentation on Anastasia in the hopes of her being able to bring the dead back to life, but due to the appearance of Howling Commandos, her aptitude didn’t reach that level of restoration.
Like Bucky Barnes, Stasi was frequently put in cryostasis, though the reason wasn't just for when she finished her missions to kill various targets that threatened the survival of HYDRA’s order, but often due to her body not being able to take any more intense experimentation. Therefore, like Bucky and Steve Rogers, Stasi hasn’t aged much, particularly since her last stint in her chamber, which was found and brought to SHIELD in 2011. There she stayed in hibernation under the careful direction of Tony Stark of Stark Enterprises until technology and testing were available to safely wake her and deal with the after effects of long term stasis. She was woken on March the 3rd, 2011 at 1:13 in the afternoon but was subsequently locked away in a high tech holding cell when she nearly killed her psychologist during her initial assessment. Little to nothing was known about Anastasia other than her physical healing and killing abilities because of her unwillingness to speak to anyone. For months she was kept under constant surveillance due to three attempts to take her own life, but with time she began to open up to a select few people who she felt she shared some common ground with.
On a deeper level, Stasi doesn’t want to be this way. When you move past all the anger, hate, and psychological trauma, she is simply a woman who wants redemption but doesn't believe she deserves it. Much of her 'therapy' has come from the mentoring of Steve Rogers who shares her experience with being in stasis and born before the second world war, Natasha Romanova as a fellow former child soldier, Clint Barton, and their comrades. It isn't long before Stasi earned their trust and was welcomed into SHIELD and The Avengers, and aiding other heroes on their missions to protect the people of earth; this time as a healer and defender rather than a cold blooded killer.
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“We can be redeemed only to the extent to which we see ourselves.”
― Martin Buber