i don't know if the time is available or not, but the first thing i would suggest is to nurse your baby more. maybe twice in the morning and twice in the evening. at only six months your baby needs to nurse more than she is. believe it or not, baby's saliva actually determines the nutrient qualities in the breast milk. therefore baby should be able to get the most out of this truly unique nutritional blend. if this is not an option and your freezer is so overflowing that you couldn't possibly provide her with even one more bottle of pumped milk during the day, then i would suggest that you continue to pump as often as works for you and then i would suggest you donate it. there are many women out there who have just the opposite problem. and even more babies unable to breast feed because their mommies are drug addicts and such. you can find out more about this option thru your local la leche league.
i actively breast fed my first until 14 months, and now my second who is 12 months nurses usually four times a day, not including middle-of-of-the-night feedings. and i work late three nights a week. both are incredibly healthy and vibrant with very few colds or signs of a weak system.
i hope this helps in your struggle.
D. :o)