Tom, I don't have any information on your Ann Urquhart, her husband or daughter, your great grandmother. But if you are going to Scotland and will visit Urquhart sites on the Black Isle, I hope you'll not miss the Cromarty Courthouse Museum and its Urquhart Room. The staff in the gift shop downstairs were VERY helpful, guided me to the upstairs file cabinets and Urquhart and Cromarty Castle files, from which it is possible to photocopy materials of interest. Urquhart connection with Cromarty Castle ended when it was sold in 1685 by Jonathan Urquhart to Sir George MacKenzie. In the 1770s, George Ross, then owner of Cromarty Castle, tore it down and built Cromarty House at the same general site, which exists today. (It is privately held, but check at the Museum to see if tours are possible -- they held hope for that last May, anyhow. If you have a chance, make an appointment to meet with the Museum Curator, David Alston before you arrive in Cromarty -- he is very knowledgeable about Urquharts. He can be e-mailed as David Alston, Cromarty Courthouse Museum at email@example.com.)
Through those years (late 1600s-mid 1700s) the Urquhart Clan Chiefship location shifted from Cromarty to Craigston (in Bannfshire, and later to what is now Meldrum House, just north of Oldmeldrum near Aberdeen). But the founts of great information are Clan Urquhart (headquartered in USA, New Orleans) and David Alston in Cromarty, Scotland.