I don't find any birth on 7 Feb 1820 in Danville. I do find a Mary Collins, d.of Moses Collins and Hannah Page, b. 17 Feb 1820 but she married Thomas Sargent and died in Danville 24 Apr 1900. I have a great deal of information on the Collins family in this area but nothing on the one you question. Can you give me a source of your information? I will try to search further for you.Which Joseph do you believe to be her father? Mother's name? I'll be glad to help anyone who has questions on the Collins line which goes back to Benjamin Collins, b. abt 1646 (proably England), d. 10 Dec 1683 in Salisbury, MA. Joyce Collins Tebbetts Davies in Kingston, NH