An Australian woman who returned home ​in September from a Syrian refugee camp has been charged with joining Isis and entering and remaining in a declared conflict zone, authorities said on Thursday.The 34-year-old, who was not named, travelled to Syria in 2013 or 2014 with other people, including a man, to allegedly join Isis, the Australian Federal Police said in a statement. The man was believed to be in a prison in the Middle East, it added. The woman is expected to ​appear ⁠in a Melbourne court on Thursday. Both offences carry a maximum penalty of up to 10 years in prison.Kurdish forces detained the woman in March 2019 and she was held with family members inside the Al-Hawl refugee camp. Police said she returned to Australia from Lebanon with another woman, 36, and that investigations into both women were ongoing. "It is ‌important to note that a period ‌of time without charges being laid is not an indicator that investigations have ceased," deputy police commissioner Hilda Sirec said."Investigations are continuing into all the recent adult female returnees from Syrian camps." The charges follow the return earlier this month of two women charged with slavery-related offences and a third with terror offences, including allegedly joining Isis. A second group of Australian women and children arrived on Tuesday from a Syrian camp with no charges laid on arrival.The return of both groups has drawn criticism from political opponents, who say the centre-left government failed to stop their travel to Australia. The government says it did not assist their travel and that there are "very serious limits" on preventing citizens from re-entering the country. Between 2012 and 2016, some Australian women travelled to Syria ‌to join their ​husbands who were allegedly members of Isis. Following the collapse of ​the Isis caliphate in 2019, many were detained in camps.