Leaving my cat alone...

This may sound like I'm overreacting a little but my kitten who is a year old has never been alone overnight. She's like my baby and I kinda panic a lot about her well being for basically everything. I don't really like leaving her alone and I know that cats are very independent and that she should be perfectly fine, but I can't help but worry about leaving her alone for the night. Should I really be worrying this much?