Suu Kyi has been confined for 12 of the past 18 years.
Her last spell in detention started on May 30, 2003 "for her own protection" after clashes between her followers and government supporters in the northern town of Depayin.
"We expected they would extend it, although there is no law that would have done that," Sein Win, chairman of the Burmese government in exile, told Al Jazeera.
"We are asking them not only to release her but to talk with her."
On Tuesday, police detained more than a dozen members of Suu Kyi's National League for Democracy (NLD) party after they marched from the party's headquarters to her home.
Suu Kyi's party has rejected the outcome of Myanmar's recent referendum on a military-backed constitution, calling the approval of the text a "sham".
The military government said on Monday that voters in the cyclone-hit country overwhelmingly approved the constitution that critics say will perpetuate the military's decades-old grip on power.
"The referendum is not free and fair," the party said in its first official reaction to the junta's claim of victory.
The generals said the constitution was approved by 92.5 per cent of voters.