Hello,
Bertha Hovde remarried after Anders Knudsen Gaard died in 1837. She married Knut Andersen Gaard on 25 May 1837. You can find the marriage record on the Norwegian Digital Archives site. The record is #8 on this page:
http://www.arkivverket.no/URN:kb_read?idx_kildeid=8814&i...Using the Digital Archive site you should be able to find other information for the family including birth, confirmation, marriage, and death records.
Good luck,
Bill