Toddlers didn't drink for 12 hours

My in laws are taking care of my almost 2 year old since I am a single mom that just had a c section. My toddler doesn't drink water sometimes sips on juice and she mainly has milk. They didn't offer her anything for 12 hours straight and I didn't know it. As soon they said she had nothing I gave her a bottle now I am panicking had that she might have been dehydrated and get renal failure or something. She seems normal playing and talking fine .I am just very anxious.help please