I've heard Fenugreek tea, available from health food shops is amazing stuff
Also, see if your CHN will loan you a pump for a few days. Long as you keep the regular pumping up for more than a few days that should amp your supply up.
Also, put baby to the breast EVERY chance you get. If she sooks, grizzles, cries, anything. Even if she doesn't drink, as long as its enough to stimulate your let down will be a huge help
Nothing works like a babies mouth, including a pump.
Good luck!!