Hun, have you tried pumping more? Try doing it as often as you can in your free time - as boobies are 'designed' to be used on a demand basis your milk flow can conform to how often milk is demanded - and as your only pumping once at work they may be 'confused' as to how much is actually needed... If you pump more frequently, the flow may increase.
If not, then it is possible to successfully feed your baby with formula supplements unless/until your flow stops altogether. If you have to go onto formula altogether, I know it's not what you wanted, and it's not ideal, but your baby has already got loads more goodness from your milk than you can ever know and it will not harm your baby to move across to formula milk.
Don't feel that you've let your baby down, either... you're doing all that you can for her and are a fantastic mother.
