Question

why did lavinia refused to hallock request returning the ouija board

Answer 1

The ghost says that she has come on his request through Ouija board to help him ... When his wife asks him to join the Ouija board, he refuses.

Answer 2

Lavina was fanatic about every new fad and the Ouija Board was in fashion at that point of time. She also said she got it for John to help him write so she refused to return it.