I just adopted her profile for the Magna Carta Project & did some updating of her bio. I tend to leave "proper use of titles" to those who know about those things. I'm also geographically challenged. I'm pretty good on what county when for Virginia but Ireland and England... not so much. Specifically, for the locations, are the following ok?
Antrim, Ulster, Ireland for Carrickfergus Castle (1332)
Middlesex, England for Tower of London (1342)
update - deleted Middlesex (see Jo's answer)
Dublin, Leinster, Ireland (1363)
P.S. The titles in the datafield seem a bit crowded: Duchess of Clarence, suo jure 4th Countess of Ulster, Baroness of Connaught
I'm tempted to go with just "Duchess of Clarence", but I don't want to unduly diminish her oomph. update - went with just Duchess of Clarence in datafield; added a footnote ref to this discussion from text that listed them (see John's answer)