If she had a suspicion then she had a duty to protect you by asking you if her suspicions were valid or watching her husband like a hawk to figure out what was really going on. This is beyond having your head in the sand. This is almost complicit in allowing this to happen. I do not know what your Mom was going through at the time so I can not blame her but wow, what a response. Thank you for being courageous enough to share your story.