Tessa McDonald, Sarah Graham and Simpson — completing her hat-trick — scored second-half goals for the 8-0 win.
Bohemians fought hard throughout but United's close-passing game cut through the defence time and again.
Campion looked confident in their 5-0 win against a depleted Marist Thistle side. Goals from Miah Somerton, Elizabeth Briant and Sofia Zame gave the students a 3-0 halftime lead on their home ground.
Zame and Lucy Allan completed the scoring in the second half.
The big game this Sunday is the top-of-the-table clash between Riverina and United at Harry Barker Reserve. Campion play Bohemians at Anzac Park. Both games start at 10.30am. The Girls' High-Marist Thistle game has been postponed.