Formula reduced

My baby is almost one year on Thanksgiving day. She was doing five bottles a day at 8 ounces but definitely not consuming all that may be consuming about 4 ounces for each of those bottles so that’s about 20 ounces

but the range would probably be from 16 to 20 ounces

but the past two days she’s only been having 2 ounces of her formula each sitting which I know they say that it reduces but in my case her food intake has not increased and she is not on milk yet lol. should I be concerned