One way to get more into bub is to give her an extra bf in the evenings - even if it's only an hour between them. And baby sucking will be more effective than pumping at maintaining supply.
Can you hand express (i.e. with your hands) once the pump stops getting stuff out - sometimes squirting out the last bit can send the "make more" signal.
Also - serious distraction whenever you can - reading (I used to read draft reports that didn't matter if they got milky), music, anything but watching milk dribble!

You may have a period back too - that can do funky (but temporary) things.