27-year-old Wayan Mirna Salihin died in Jakarta earlier this month (Jan) after having an iced coffee with her friends - known as Jessica Kumala and Hani.
It's believed her drink was laced with cyanide.
Following weeks of investigations, Jakarta police arrested Kumala today.
The three women studied together, reportedly at Sydney's Billy Blue College of Design and Swinburne University of Technology in Melbourne.
It's understood the Australian Federal Police are considering a request from Jakarta police for assistance.
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