The Young Lionesses routed the host nation Lithuania 10-0 to lay down a marker in the eight-team tournament.
Pritchard, who joined City from Durham last January, has been something of a scoring sensation for her country.
The 18-year-old striker came into this game with nine goals in nine games.
Pritchard took just five minutes to open her account and put the young Lionesses 1-0 up.
It was a typical poacher’s goal as she followed up a 20-yard effort after the keeper could only parry the ball into her path leaving the City teenager to tuck home from a couple of yards.
Her second came on 39 minutes when Katy Watson’s low cross was turned in at close range by Pritchard to put England 5-0 up before the break.
And it took Pritchard less than a minute to complete her hat-trick after the restart, firing home emphatically from 10 yards out with a powerful angled shot to give the keeper no chance and put England 6-0 up.
Pritchard added an assist to her day’s work, setting up England’s ninth goal on 69 minutes for Lexi Potter.
Arsenal striker Michelle Agyemang also bagged a treble, with Vivienne Lia, Watson and Madison Earl also on target.
England top Group A, with France winning 3-1 against Serbia earlier in the day.
England are chasing a second triumph in the Euro U19s having won back in 2009 and will be back in action against Serbia on Wednesday morning before completing the group phase against France on Saturday.
