Feeding baby too often?

Lo
My daughter is about to turn 3 months old, and she drinks 4 oz. of formula every 2.5 hours. Everything I read says by this point baby should eat every 3-4 hours, but she can't make it past 2.5. Am I feeding her too often? When I was breastfeeding I didn't have to worry about this, but since I was put on meds when baby was 3 weeks old, unfortunately I haven't been able to. Also, how do I know when to begin giving her more formula? If she's still fussy after feedings?
I guess I should also add that my daughters last bottle is usually between 11:30 PM - 1:00 AM , and she doesn't eat again until around 7:30 AM - 8:30 AM. I give her a little extra during those feedings since they're long stretches without eating. 
Thanks everyone ☺️

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