Will my baby be okay???

I told my sister to watch my baby while I went to the restroom and she said she accidentally gave her old formula that was sitting in her bottle from hours ago that baby didn’t finish, she said she thought it was fresh and since it was cold my baby rejected it and only took like a taste or a sip she said. Will my baby be okay? I feel so bad 😭 I don’t want anything to happen to her.