From the context of your sentence it would seem the first word should be "He" instead of "She". What the sentence means is that the father doesn't like the person and has forbade entry to the house except when someone would notice it and mention it. I guess it has to do with people's sense of decorum. For instance, if he was a member of the family and they were holding an important family meeting it would be strange if the father still forbade the man's entry into the house (because the man is family and should be there and should he not other family members would comment). It's almost as if there is some dark secret between the father and the person he forbade entry and only a couple of people know about it. So they act normal in front of others but otherwise he is forbidden to enter the house. I hope that helps.