Less interest in bottles

So is anyone else’s baby becoming less and less interested in having a bottle? My daughter will hardly finish a bottle anymore. I’m worried she isn’t getting enough. She was eating 7ozs every 4 hours but lately she’s been leaving 1-3 ounces left sometimes even 4. When she’s done she will turn her head and push the bottle away. I will keep trying to offer the rest to her till it expires but usually she doesn’t finish it. I hate hate hate wasting formula because it’s so expensive but I know the minute I make her less she’s gonna want more 🤦‍♀️