Bottle feeding to a sippy cup

My LO is 14 months old and has always had frequent bottles since she was a baby..every 2 hours. I've tried to push it longer but she gets really fussy. She eats solid foods great and has even upped how much she drinks (now 8 oz) but Im not sure how to break out of this this habit. Now that we're trying to transition to sippy cups its been difficult but since she turned one in August she also now gets up every 2-3 hours at night and hungry! 😫😫 I try to look up solutions online but of course can't find any suggestions on getting her to extend time between bottles. Any moms out there that have had this same issue? I know every baby is different but this is just madness! Any help is appreciated ❤