At about 9.30pm yesterday, emergency services attended Lake Haven Drive, Kanwal.
A 28-year-old man and a 31-year-old woman were found suffering multiple stab wounds.
They were airlifted to John Hunter Hospital in what police said was a reportedly stable condition.
A few hours later, police arrested a 29-year-old woman at a unit on Cutler Drive, Wyong, at about 12.30am.
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She was charged with two counts of wound person intend to cause grievous bodily harm (DV).
Police will allege in court the man and younger woman are known to each other.
The woman was refused bail to appear in court today.
