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it is common for babies to go on nursing or feeding strikes when a regular schedule is broken. so it sounds like her not wanting to eat during the day is just a bit of a strike, and the more it is forced, the harder it is going to be for her to feel safe with the people doing the "forcing"
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contact someone who can help you, and keep nursing! you are doing awesome, and im so happy you have nursed so long! :D
just have patience with her.
when formula is given, it is common that a baby would need more water. no one tells people that, and it causes a lot of issues. its more concentrated, so it can be very constipating, breastmilk has a lot of water in it, so it typically does not.
also consider an allergy to the type of formula given.
buuut, it sounds like she is fine. she could have a teething issue, she could have a flu or cold bug (do not panic, shes probably going to be fine, especially with your keeping so close an eye on her!)
so just allow her to nurse on demand, or whatever you need to do. wont day care accept pumped breastmilk? that seems rude, and you should see if you can press them harder to do things the way you want.. it is your legal right to have your child fed the way you feel is best.
anyway,
just relax and keep up the good work! :D