Baby not taking bottles today

So my daughter (6mos) has only drank about 8/9oz of formula today. A 7oz bottle this morning at 7am. Refused to eat her 11am bottle. Offered many times throughout the day. Then drank 1-2 oz of a 3:30 bottle. And refused bedtime bottle at 6:30. Has anyone been through something similar?

So for reference she usually has a bottle at 7a/11a/3p/6:30-7p/11p about 30-35 oz a day. No solids today. She has been trying them out for a little over a week and hasn’t shown interest the past two days. And for naps today she has only take 3- 45 min naps and refused one after 3:30 so was very ready for bed by 6:30. But she’s been a happy baby all day so nothing seems off. But it just is so little to eat in one day.