Don't know if anyone had thought of this but .....maybe before Bea entered the house she had an agreement with her mother that, if she was to be seen negatively by the GBP then her mother was not to write/be filmed for the message home aspect.(As the contact with home IS a yearly part of the program)

Either that or she thinks banging on that she will be nommed may pressure housemates not to nomm her.....shame she is doing the opposite!