A Florida woman, 21, has been charged with driving under the influence manslaughter after she allegedly hit and killed a 13-year-old girl who was sitting in the street in February, police said. When Mackenzi Sue-Rose Miller allegedly struck and killed Trinity Backmann on February 28 in Apopka, her blood alcohol content level was over the legal driving limit, police revealed after a month-long investigation. Her BAC levels were 0.114 and 0.110, lab tests showed. The legal limit in Florida is 0.08. Mackenzi Miller (left and right), of Apopka, Florida, was charged with DUI manslaughter and DUI while causing injuries after allegedly hitting and killing 13-year-old Trinity Bachmann. Miller's blood alcohol content levels were 0.114 and 0.110, while Florida's legal driving limit is 0.08 . Trinity Bachmann was sitting in the middle of the road arguing with her mother when both of them were struck by the car . Miller was booked into the Orange County Jail on Thursday after turning herself in and is out on a $3,500 bond, according to the Orlando Sentinel. Trinity was sitting in the road after an argument with her mother when she was killed, police said. Trinity and her mother, Janice Pedroza, 36, were heading home from dropping one of the girl's friends off after they attended the Central Florida Fair at about 8.30pm. After an argument about who would sit in the front seat, Trinity said she would walk home and got out of the vehicle, police said. Trinity (left and right) and her mother, Janice Pedroza, 36, were on their way home from the Central Florida Fair, where Trinity was planning to show her pig as part of the Future Farmers of America program . Trinity and her mother had been arguing over who would sit in the front seat of the car when Trinity said she'd walk home, got out of the car and sat in the street. Pedroza had gotten out of the car to move her when they were struck . She eventually sat in the middle of the road, which is when Pedroza got out of the vehicle and tried to get Trinity to get back into the car, which she refused, police said. As they were arguing in the street, Miller allegedly struck both of them with her vehicle, injuring Pedroza and killing Trinity. Police said Miller reeked of alcohol, had glassy, bloodshot eyes and had an open bottle of Mike's Hard Lemonade in the car. Police said Miller reeked of alcohol and had an open bottle of Mike's Hard Lemonade in the car when she allegedly struck Trinity, pictured right with her sister Ana Cruz (left), with her car . Trinity's sister Ana Cruz said that her sister was her best friend and that her family needed 'to be strong' to get through the tragedy . She also faces a DUI while causing injury charge. Trinity's sister, Ana Cruz, said that her sister was her best friend. 'We talked about boys and makeup. We did our nails,' she told WESH in March. 'I was told that God takes the ones he needs and he needed her. We have to be strong and be together.' Trinity was at the Central Florida Fair for a Future Farmers of America program, where she was preparing to show her pig, Robin. A memorial still sits on the side of the road near where Trinity and Pedroza were hit. One message says 'I'm gonna miss you so much! I miss you baby girl! Rest in peace'
Mackenzi Miller struck and killed Trinity Bachmann with her car on February 28 in Apopka, Florida .
Trinity was sitting in the street while having an argument with her mother .
Trinity's mother, Janice Pedroza, 36, was also injured in the crash .
Police said Miller reeked of alcohol, had glassy, bloodshot eyes and had an open bottle of Mike's Hard Lemonade in the car .
Her blood alcohol content levels were 0.114 and 0.110, police said .
Miller faces DUI manslaughter and DUI while causing injuries charges .