Two portraits of Phoebe Frances Ricker, 1846-1859,probably of Massachusetts, are listed in the online catalog of Skinner's Country Americana auction on 14 August 2005 in Boston, MA.
The first may be found at:
And the second may be found at:
If these addresses don't work, go to the Skinner Web site at: www.skinnerinc.com click on "Catalogue Search" and go through the pages until you come to the 2 portraits of Phoebe.
If you still can't find them, let me know by email (my address can be found by clicking my underlined name above), and I'll send copies of them to you by email. Do not reply to me on this board because I may not see it.
If they were portraits of a Pease child in my line I'd certainly want someone to do the same for me.