Why is my 2 mths+ baby doesn't want to drink milk on feeding time?

My 2 mths+ baby recently does not want to drink milk on feeding time even though she is hungry. She prefer pacifier and when I insert the bottle in her mouth, she start to struggle and cry... It takes a hard time to feed her... Is there any solutions for this? And sometimes when she drink, she doesnt finish her 4oz milk but only drinks 1 1/2oz to 2oz of milk only.