I've been giving it to Daisy since the last week or so of her pregnancy, sometimes she drinks it up right away and looks for more other times she turns her nose up at it lol, it certainly can't hurt and its good to replace some of the nutrients the babies are taking from her.
It's fine it's full of nutrients and iron and she had digested a lot worse seen as she is an ex stray. She won't have much a day. Kittens are really advanced could be the milk or just cause she was late. Who knows