feeding and bottle feeding?

So we have been doing both now and my baby is 5 weeks old but today and this morning she refused to feed... when offered the bottle after an hour of calming her and trying to feed she took the bottle like a trooper. I dont know what to do.. i cant really pump because of my job thats the whole reason we are formula feeding her from about 8am to 7pm. Then any time in between is feeding. But now she wont feed... what should i do?