Once Ben stirred from his seated position, Ginny was on the ready to immediately transport herself back to safety. In his newly-wiped state, Ben might stagger back under the wards and see Ginny, which would be confusing and potentially problematic.
Thankfully, Ben started a slow plod in the general direction of the pub. Unconsciously, Ginny had placed her free hand over the shrunken vial holding Ben's memory and was pushing it into her chest, it would cause a sting that Ginny could not yet feel. She watched him fade into the distance; the relief and sadness caused a few tears to fall from her eyes.
Slowly, Ginny began to feel the trinket pushing into her chest, even if she was the cause. The sight of her silvery breath and the feel of her feet on the ground brought the witch back to herself. With Ben completely gone from her vision, and nobody else around, she mechanically brought down the wards and quickly transported home.