It is hard to wean a baby, especially for a baby that age, I weaned my kids at a year as well. I just couldn't do it anymore.
My suggestion is to start having daddy or someone else feed her from the bottle more and more frequently. Once she gets used to it it will be easier for her to 'forget' that the breasts are for feeding.
Try not to get undressed in front of her until she is weaned because if she sees them she will want to nurse.
Another thing that might help is introducing her (if you haven't already) to teething cookies and crackers. If she gets angry at the bottle you could try tea instead of formula once in a while.
Good luck!