S.M.
I know that pumped breastmilk is liquid gold, and it's frustrating when they don't take it all. If your daughter isn't showing signs of hunger after a bottle feeding she is probably getting enough. The big difference between bottles and bf is that we can see how much they are actually eating.
You can save that ounce for up to a week in the frige and add it to another?(just don't add cold to warm milk) Or freeze it. I found the Ventaire is the best too for air bubbles. That is great she is even taking a bottle, my son hates the bottle and pacifiers, he spits them out and throws a fit.
Good Luck and hang in there!