Can my milk come back?

My milk supply went down bc I stopped breastfeeding since my baby wouldn't latch. I pumped a week ago and barely got an ounce. But lately my baby has been latching on and sucking, except now nothing comes out. She just uses me as a pacifier. If I let her do this a bunch of times a day maybe before almost every feeding ( she has 4 oz of formula), will my milk supply come back or is it too late? She's five weeks