Horrible having to tell the children. mine find it a bit easier if they see them and can say goodbye. at first i thought this a bit gruesome but it is all part of life and it helped mine to realise what death was. i always think it is better when they go quickly.
sorry to hear about Mollie, it's such a shock when they go like that but from what I gather from talking to people it is not that uncommon for a seemingly healthy bird to just keel over and die . Hope your ds is ok.