Bf baby refusing the bottle

My 6 mo old baby is exclusively breast fed, but I work full time so during the day at daycare,she takes bottles. She eats like a maniac and has had no problems. The issue is, whenever I leave her at home and dad or grandparents offer her a bottle, she refuses! It's like she knows if she's at home that I'll eventually be home soon and holds out! The problem is, I'm going to be away from her for 5 days next month and I'll need her to take the bottle from dad. Any suggestions?