The 34-year-old woman was arrested at her Everard Park home yesterday.
She was charged with attempting to murder Jonathon Hawtin, 36, in 2018 at the Hampstead Rehabilitation Centre.
She will face Adelaide Magistrates Court today.
Both Lines and Bruckner have been extradited to Adelaide where they remain before the courts.
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The complicated timeline of events began in 2017 when Hawtin was seriously injured and left a tetraplegic after he was allegedly attacked with an axe.
In the same incident, Bruckner suffered a gunshot wound to the abdomen, which police now allege was self-inflicted to stage a self-defence case.
Hawtin was charged with attempted murder but acquitted at trial.
Today’s charges relate to an allegation that Lines sent the woman to suffocate Hawtin while he was in a rehabilitation centre after the 2017 axe incident.