The best bet in terms of a marriage I can find is in 1881, registered in Borrisokane. Unfortunately there is no image available for the cert online but you could order this if you wanted to confirm. This gives Honoria's maiden name as Hogan or Hagan.
There are several possible baptisms in Tipperary around 1855: one in Silvermines and one in Ballysheedy in 1857, one in Clonmel in 1855 itself and another in Clonmel in 1856. If you wanted to go for the 1855 one based on the DOB given in the death cert, her parents would be Jacobus Hogan and Margaret Walsh and the baptism was 29 October.
If you had them in the 1901/1911 censuses you might be able to get a feel for the accuracy of the DOB but the census DOBs are typically not accurate.
Hope that helps.