Formula

My baby has been breathed and formula fed I exclusively pump than feed her from the bottle so I can keep track of how many ounces she eats. Now I’m going back to work and I’m not producing a lot milk so I’ve been running to increase her formula and she is refusing to eat or I’ve tried everything. I’ve tried changing formulas different bottles different nipple and she will not eat more than maybe 2 ounces each time and I’m not producing more than 3 ounces of milk each time I pump idk what to do anymore. Anyone else with this problem?