Yes, it's possible, though not easy. If you CAN pump, do. Don't worry about pumping for 20 to 30 minutes. Pump for 5 minutes if you've got 5 minutes. Anything to stimulate the breasts will help. And be sure to nurse nurse nurse when you are with the baby at home.
Chances are it isn't that she's not getting enough milk. she just isn't getting it soon enough. She's used to that bottle where there's no work at getting the milk to come. Your breasts require a little more work for her! Try to hand express or even pump for a minute or two to get a let-down, so that when she gets on the breast, she doesn't have to work so hard to get the milk, it's already there.
Eventually your body will learn when to make milk, and when not to. I've seen it done plenty! I'm a breastfeeding counselor, and I have moms who have to work hours at a time, then have two days in a row off, and their bodies have adjusted to making milk the two days they are home, and not making much on the days she works. It's amazing how your body works! We can easily make breastfeeding so much more complicated than it is. You will notice soon that you aren't making very much milk while you're working, but when you are home, you may notice an overabundance (though if you aren't noticeing more than you need, it doesn't mean you are making what you need!)
So many times moms actually make more than they need, instead of not enough like most believe. You're most likely fine. Keep at it, try not to give in and give the bottle. Just try dripping breastmilk into her mouth, then putting her on the breast when the milk is flowing.
Please feel free to contact me personally if you have any more questions
PS. Contrary to what some moms/doctors may tell you the amount of liquids you drink, does not affect how much milk you make! You can drink three gallons of water and it will just make you have to pee three gallons of water! The reason you need to keep hydrated isn't for your supply, it's for you! Drink to thirst, eat to hunger, but don't believe that you will not be able to make milk if you don't drink milk/water/juice! The cows milk you drink does not make human milk, so drinking milk will NOT help you make milk! Has nothing to do with it. It's for your benefit, keeps you healthy.