The young woman from suburban Sydney, who was arrested on today, is among several teens charged in recent months over alleged plots, as Australian officials become increasingly concerned about homegrown extremism.
The New South Wales state Joint Counter Terrorism Team (JCTT) said it charged her with counts of "recklessly possess a thing connected to a terrorist act and recklessly collect documents connected to a terrorist act."
State police Deputy Commissioner Catherine Burn said the charges were linked to a previous case involving an 18-year-old man, who newspaper reports identified as her husband.
"We have previously charged an 18-year-old male with matters relating to this particular act that we are talking about and those matters are also before the court."
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Her arrest comes one month after her reported husband Sameh Bayda faced a Sydney court on three counts of collecting documents likely to facilitate terrorist acts, reportedly including advice on carrying out a stabbing and making a bomb.
Last October, a 15-year-old boy shot dead a civilian employee outside police headquarters in western Sydney before being killed in an exchange of gunfire with officers.