Hawkins, whose sentence was back-dated to reflect time already served, was also fined 5,000 Malaysian ringgit (£860/$1,330) on Friday.
She and her co-accused all admitted a charge of "committing an obscene act in public".
Hawkins, who is from the Derbyshire village of Draycott, said she had been "stupid and disrespectful".
Prosecutors said the four tourists, along with six others, climbed the peak to enjoy the sunrise on 30 May and then challenged each other to take off their clothes and pose for photographs.
The move caused widespread offence in the region and was regarded as the cause of a magnitude 5.9 earthquake near the mountain, which is considered sacred.
The earthquake, on 5 June, killed 18 people, including children, and left hundreds more stranded.
Sabah state deputy chief minister Joseph Pairin Kitingan blamed it on the travellers showing "disrespect to the sacred mountain".