She has been detached from those parents because it does not appear that this couple had any daughter named Margeret.[1][2] It is unclear whether this person ever existed.
Other Notes
The Douglas's of Lochleven were collateral to the Douglas Earl's of Morton according to Complete Peerage,
Could this Margaret be the same as the Janet Douglas, also known as Margaret, who married James Colville of Easter Wemyss ? Urquhart-93 04:58, 16 February 2019 (UTC)
Parents of this profile are too young to have had this person, either incorrect parents are linked or incorrect birthdates somewhere. Siblings are all born at least 10 year later, which also makes birthdates suspicious.