C. M. Munthe: "Biskop Ludvig Munthes hustru Ingeborg Sørensdatter Friis's slægt." Personalhistorisk Tidsskrift, syvende række, bd. 1, side 242
MUNTHE SLÄGTEN: från MEDLET AF 1000-TALET TILL NÄRVARANDE TID by Ludvig W. Munthe, published Helsingborg, 1883. 312 pages. - p. 163.
(Considerable data on Ingeborg as she was part of the Munthe family line.)
Munthe family & descendants info from Sverre Munthe’s website
(More up to date version of the Munthe family tree, using these birth, marriage & death dates as they are more definite than the ones I had from other sources.)
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I see there is differences in the sources. A source that is available online for Norwegian IP adresses is "Efterretninger om Familien Munthe i ældre Tid" 1883 written by Hartvig Munthe.
http://www.nb.no/nbsok/nb/394a4a158dccabc8afb7b00c16a36758.nbdigital?lang=no#84
On page 69 it says her mother was Elisabeth Handatter Svaning, married to Søren Friis, mayor of Copenhagen.