My about-to-turn 11-month-old nurses every 3-5 hours during the day on weekends, and gets two 4-oz bottles a day while I'm at work. She would get more EBM if I could pump more but, like desertgirl01, that's all I can pump these days and my frozen stash is long gone. I also don't worry because she nurses as soon as I get home, and then again about an hour later when she goes to sleep for the night. She wakes sometime between 4AM-6AM to nurse, and then nurses again before I leave for work at 8AM. Occasionally she nurses in the middle of the night, but that's rare.
Your baby will probably be fine if it's a 4-5 hour stretch at day care and she gets a meal during that time, but having a bottle on hand is a great idea, just to be sure.