Wales Women won the Northern Cup with a 42-34 win over Scotland in the final of the tri-nation tournament at Sophia Gardens, Cardiff.
The hosts had beaten Singapore 75-28 in the three nation tournament's opening match on Monday.
But Melissa Hyndman's team lost 43-36 to Scotland on Tuesday and needed the Thistles to beat Singapore to secure a place in Thursday's final.
Hyndman's side used the event to prepare for July's Commonwealth Games.
Wales' team for the Glasgow-based games will be named in May.