Police say a "Fast and Furious mentality" led to Tuesday's collision on the Western Highway which claimed the life of a "beautiful angel" during a high-speed police pursuit.

A 17-year-old boy was allegedly driving a Toyota Hiace van at more than 100km/h when it hit a parked VicRoads truck about 2.30pm.

The roof of the allegedly stolen van was ripped off "like opening a tin can", police say, killing 16-year-old passenger Jacqueline Vodden.

Jacqueline's devastated mother Naomi posted on Facebook early on Wednesday morning "I just want my baby back".