The article below has a very detailed timeline —
Timeline of events in the murder of Tristyn Bailey | firstcoastnews.com
Friday, May 7
Tristyn was seen with fellow classmates at the Durbin Crossing Food Truck Friday event. Her mother said a friend's parents drove them to the event and also picked them up afterward.
Saturday, May 8
11:45 p.m.: The Bailey family arrived home after going to dinner, then visiting one of their adult daughters.
Sunday, May 9
12 a.m.: Tristyn's sister last saw Tristyn speaking with an unknown white male wearing a backwards white baseball cap on a video chat in the garage at approximately midnight.
12:25 a.m.: Cellphone records obtained from AT&T show Tristyn had an incoming voice call from a phone number later identified as Aiden Fucci.
12:30 a.m.: [Redacted by me] says Tristyn arrived at his house.
1 a.m.: [Redacted by me] says Tristyn and Fucci left his house after hanging out late Saturday night.
1:24 a.m.: Surveillance video from the Durbin Crossing North Amenities Center shows two subjects walking past the main entrance along the sidewalk.
1:45 a.m.: Surveillance video obtained by detectives from a neighborhood resident, shows two subjects walking east on the sidewalk of Saddlestone Drive toward a pond.
3:27 a.m.: Surveillance video shows one subject walking west, away from the area of the pond.
10:00 a.m.: Tristyn's mother called 911. [The mother] said Tristyn was last seen at approximately midnight by another sibling and was supposed to be sleeping in her bedroom.
I’ve condensed some of the above timeline for relevance and removed the names of witnesses out of respect for their privacy. The linked article contains the thoroughly detailed timeline in its entirety and much more information.