Freshman Jessica Lindstrom led a balanced attack with a career high 13 points and nine rebounds to lead the Phoenix (16-3, 6-0 HL).
Mehryn Kraker and Megan Lukan each added 10 points. Green Bay held Valparaiso (4-16, 0-7) to 2-for-12 shooting from three-point range and forced them into 21 turnovers.
After hitting a program record 16 three-pointers one game earlier, the Phoenix hit just 8 of 30 (26.7%) and committed its second highest foul total this season with 23.
Green Bay ends a four-game road trip at Illinois-Chicago on Saturday.
At Cleveland, Ashley Green and Jaleesa Armstrong each scored 16 points but the Milwaukee Panthers (7-12, 3-4 HL) fell to Cleveland State 67-58.