Personally, as someone who was looked after by a variety of people other than my mother when I was growing up (paid and extended family) I don't think that having a nanny nessescarily interferes with the mother/child bond. It's possible to be sad that the nanny/career is going home whilst simultaneously loving your mother very much. As humans we're capable of loving many other people so I don't see affection for a nanny as an indication of lack of affection for Mum. In fact it could be evidence of a loving mother selecting the best possible care for her children while she is unable to provide it.