My baby is coming to 6 months old is having a milk strike for the past 2 days Is it cause of a leap?

My baby is coming to 6 months old is having a milk strike for the past 2 days. Prior to this episode, she has been drinking well. But for the past 2 days, it was a difficult task for us to feed her (managed to make drink 500ml compared to the past of 850ml -900ml) she is bottlefed with EBM. Today she has not drank for close to 10 hours. This is worrying.. Any advice? Thanks in advance!