Mariam took up rhythmic gymnastics after a friend of her mother's, who was a coach in the sport, encouraged her mom to sign her up for classes.[3] In 2009 she was crowned Canadian junior champion.[3]
She became a senior in 2010, debuting in January at the World Cup in Montreal where she was 15th in the All-Around.[4] In Corbeil-Essonnes she finished 27th overall.[5] In May she took 16th place in the All-Around at the stage in Minsk.[6] In late August she took 52nd place at the stage in Pesaro.[7] She was then selected for the World Championships in Moscow, she was 24th in teams, 57th in the All-Around, 52nd with rope, 84th with hoop, 59th with ball and 60th with ribbon.[8] In October she was part of the Canadian delegation at the Commonwealth Games in Delhi, being 4th with ribbon, 5th with ball and in the All-Around, 6th with hoop, 7th with rope and won silver in teams along Demetra Mantcheva and Alexandra Martincek.[9] In December ahe won team bronze and silver with hoop, being promoted of one place after Ruth Castillo Galindo was disqualified, at the Pan American Championships.[10][11] That year she also won the senior Canadian Championships.[3]
In 2011 she competed in the World Cup in Montreal, taking 8th place overall and with hoop, 7th with clubs and 6th with ball.[12] In March she competed in Pesaro, being 31st in the All-Around.[13] In the stage in Kyiv she took 16th place overall.[14] In September Chamilova took part in the World Championships in Montpellier, finishing 67th in the All-Around, 71st with hoop, 74th with ball, 64th with clubs, 61st with ribbon and 20th in teams.[15] A month later she was selected to represent Canada at the Pan American Games in Guadalajara, she was 4th in the All-Around, with hoop and with ball, 5th with ribbon and won bronze in the clubs' final.[16]
Mariam retired the following year after failing to qualify for the 2012 Olympic Games. She then graduated with a degree in law and started working in a law firm.[17]
Canada 
Canada _(cropped).jpg)
