After taking the first trick, Pris should not lead the JS on the 2nd trick with no ace to promote. The correct lead is the TC with the hopes of promoting the KC for later. If Pris takes this line she gets a point easily. Instead, by leading the Right bower for essentially no good reason she played right into enemy hands. This is the type of mistake I see A LOT. People just think they gotta lead the right in that spot, and then when they get set they say "Had 3 trump, 2 suited, whaddaya gonna do".
And the answer to that rhetorical question is go to this site and read this article damnit!!
https://ohioeuchre.com/E_ThreeTrumpTwoSuited.php