The beauty queen is seeking assistance of the United Nations refugee agency to avoid being sent back to Myanmar, where she fears harsh punishment from the military government she has criticised.
Some children were killed on the spot by the shooting, while others died after troops entered the village in the central Sagaing region, according to local media reports.
The event is the latest in a series of incidents where shells have exploded in Bangladesh, but the first to cause a fatality.
After hearings that were closed to the media and the public, a military court found freelance journalist, Htet Htet Khine, guilty of incitement.
Foreigners, including US, British, Japanese and Australian citizens, have been held since the military seized power last year, arrests that human rights groups say are designed to discourage dissent.
Myanmar's deposed former leader Aung San Suu Kyi is "sentenced to three years imprisonment with hard labour", a source with knowledge with the case says, adding that the Nobel laureate, 77, appeared to be in good health.
As Rohingya mark 5th anniversary of exodus to Bangladesh, UN chief notes "the unflagging aspirations for an inclusive future" for the minority, who face widespread discrimination in Myanmar.
Myanmar's military chief says the junta is open to negotiations with ousted leader Aung San Suu Kyi to end the crisis sparked by its coup after her trials in a junta-run court have concluded.
UN rights chief Michelle Bachelet has met with Rohingya community members during a tour of their camps in Bangladesh and said they had expressed hope that they would be able to go back to their homes.
Diplomatic efforts to resolve Myanmar crisis led by the UN and the Association of Southeast Asian Nations regional bloc have made little headway, with the generals refusing to engage with opponents.
The trial of deposed leader Aung San Suu Kyi was held behind closed doors with no access to media or the public.
UN rights chief meets senior officials in capital Dhaka to assess human rights and conditions of Rohingya refugees.
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