Suu Kyi has been in Australia since Friday, attending a special summit of Association of Southeast Asian Nations (ASEAN) leaders in Sydney, where her presence drew street protests and a lawsuit accusing her of crimes against humanity.
Australia's Attorney General has said he would not allow the lawsuit, lodged by activist lawyers in Melbourne on behalf of Australia's Rohingya community, to proceed because Suu Kyi had diplomatic immunity.
U.N. officials say nearly 700,000 Muslim Rohingya have fled Buddhist-majority Myanmar to Bangladesh after militant attacks on Aug. 25 last year sparked a crackdown, led by security forces, in Rakhine state that the United Nations and United States have said constitutes ethnic cleansing.
The U.N. independent investigator on human rights in Myanmar, Yanghee Lee, said in Geneva this month she saw growing evidence to suspect genocide had been committed.
Myanmar denies the charges and has asked for "clear evidence" of abuses by security forces.
Suu Kyi had been scheduled to give a speech and answer questions at a foreign policy think-tank event in Sydney on Tuesday but cancelled because she was not feeling well, event organisers said, without giving more details.
Suu Kyi's spokesman Zaw Htay declined comment and referred questions to the Myanmar embassy in Canberra. A Reuters call to the embassy went unanswered.
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