Refuses bottle

My daughter is almost 6 months old and is EBF. In the occasion the kids are with my mom, my mom would give a bottle of frozen breast milk. Just this last time my mom was watching the kids my daughter refused the bottle! Wouldn’t even put it in her mouth. It had been about a month since she was last given a bottle. I tried switching bottles (went from Dr.Browns to Avent), tried giving freshly pumped milk opposed to frozen milk and still nothing. 😔 Anyone have any tips on getting her to take a bottle again?