Funeral for mother of 2

On Monday night me and my children were informed that my wife had suddenly died.  This was a massive shock to us and we are all left feeling empty and like we never got the chance to say goodbye. My children are only 14 and 11. Catherine was a dedicated mother and she lived for our children. It still doesn't feel real to us and we still keep thinking she's going to walk through the door.  As a retired and now single father,  the funeral seems so far out of reach Financially. Anything that anyone can donate even pennies would be a massive help.  Me and the children would just like to give her the send off that she deserves