Hey, F.. Yes, she will definitely get it, don't worry. Just keep offering it. A friendly suggestion: put water, not juice in the cup. She should be drinking some water about twice a day pretty soon. Drinking like a "big girl" is its own reward, so she doesn't need sweet stuff. SOmetimes it is hard to get kids to drink/eat healthier choices if they have the "good stuff" first. My daughter prefers water to anything else, and I believe it is because that is the only thing she had from a cup early on. You might try offering it with meals in the high chair while you sip from your own cup. She'll probably want to copy Mama. It is totally normal for her to just chew on the spout (might try to use a soft spout, BTW), or spit out water, etc. One day she'll just "get it."
One more word...don't worry about weaning right at 12 months...unless YOU want to. If you do, then great, go for it. I had some idea that my milk would just magically "go bad" at 12 months, since that is the age the doctor said to wean. On the contrary, breast milk continues to be just as rich that second year. Pediatricians picked the "12 month" mark arbitrarilly (just as they picked 6 months a couple of years ago) as the recommended length of time for BFing. I believe it is because they thought they'd get better compliance than if they said 18 months! My daughter has severe milk and soy allergies, diagnosed at 12 months. I refused to give her that HORRID Nutramagen formula (also VERY expensive), so I talked to some lactation specialists. Long story short, I am happily nursing her at 18 months. We are being tested again, and hopefully she will be allergy-free and able to wean to "Normal" milk when she is ready. I know it makes some people uncomfortable, but I am doing what is best for my baby, and I don't care what people (espeically uninformed or jealous people) think. Good thing about being a SAHM...nobody watching or judging. You are lucky to be able to nourish your daughter in such a special and healthful way. Enjoy it, and good luck!