Louella Fletcher-Michie, 24, is seen in high spirits as she was recorded playing with fairy lights and festival wristbands.
At the same time, a voice off camera is heard calling her “festival fairy Louella” before she replies saying “pixie love”.
Her boyfriend – Ceon Broughton – can be seen lying next to her smiling during the clip.
Shortly afterwards, Louella reaches over to her boyfriend and plays with his hair.
Broughton is on trial at Winchester Crown Court where he standing trial for her manslaughter.
Louella, a yoga and dance teacher, took drug 2-CP on September 10, 2017, before dying in a wooded area just one hour before her 25th birthday.
Winchester Crown Court heard how Louella is believed to be the first person in the UK to have died after taking the drug.
The jury heard how she would have needed to have her stomach pumped immediately after having taken the drugs allegedly given to her by Broughton at Bestival.
Broughton estimated that Louella had taken a deadly amount of the drug, although results from her post-mortem were not conclusive.
Jurors also heard how Louella hit herself and screamed “like a wild animal”, following a “bad trip” as Broughton filmed her on his phone.
The jury has started to deliberate over a verdict, which is set to continue later today.
Broughton, 30, of Enfield, north London, has denied manslaughter by gross negligence and for supplying the drug.