According to media reports, Mejia pleaded guilty and asked for leniency. The judge, Masanori Nagahashi, however, sentenced her to three years in prison, but took her absence of a criminal record into account, suspending punishment under the condition that Mejia maintain good behavior for four years.
Under Japanese law, Mejia could face a maximum of 15 years in prison, but prosecutors asked for a term of 3 years.
The accident sparked further backlash among Okinawa residents against US troops stationed on the island, and embarrassed US military officials as it came within weeks of murder allegations against a former Marine.
It is unclear whether Mejia will remain in Okinawa or in the US Navy.