I asked some cousins, and their best guess is that Peter and Jane were somehow related. Peter's grandparents were Nicholas Kearney and Bridget Gorman, married in 1780. Haven't found grandparents for Jane Toole. There were Tooles living at the foot of Carrickgollogan, near the Kearneys, but Jane appears to have come from Bray Town, and there is a James Toole, probably her father, living in a lane off the Main Street.
Another suggestion, grasping at straws: Peter's father, also Peter Kearney (1787-1870) received the lands of some other families who were evicted in 1862 by the notorious evicting landlord Charles Compton Domville. One of those evicted was a Molly Toole, who I am sure was Mary Neill, married to Morgan Toole, probably deceased by the time of the evictions. I wonder was there animosity at Peter Kearney for having received the Toole land? I can't find a likely connection. Morgan Toole had a brother James Toole born in 1806, a little too young to be the father of Jane Toole in 1823, whose sister was born in 1819.