A changed side lined up for The Bees, largely due to injury problems in the squad. Luna Dalton, Regan Graver, Gemma Goodwin and Jess Stickley all came into the XI as Mollie Holmes, Nadia Peters, Jodie Reid and Eilidh Short dropped to the bench.
Wiltshere scored Brentford's goal in the first half, netting her second in as many games after her role in the 3-1 win at Enfield the previous weekend.
Two goals from Dulwich's Catherine Campbell turned the game around in the second half. The result left Brentford in mid-table.
Bees: Boycott; Goolab, Graver, Langston-Lloyd, Webb; Troth, Goodwin; Stickley, Wiltshere, Dalton; Spencer-Dempsey
Subs: Holmes, Peters, Reid, Short, Baranowski