Forum:Mirror force and book of moon

i summoned krebons and i had a injection fairy lily on the field from a previous turn, my opponent had a face up defense position level eater. i declared an attack with krebons and my opponent activated mirror force, i had face down book of moon i set a while back and chained it to put injection fairy lily face down.

can i, in main phase two flip the injection fairy lily back in face up attack since i didnt declare an attack with it and she was summoned on a previous turn?