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"The identity of Annabella's mother is unclear, but she was probably Mary, daughter of William Montefichet."
Mary married Sir John DRUMMOND of Stobhall, son of Sir Malcolm DRUMMOND and Unknown, about 1345.1 (Sir John DRUMMOND of Stobhall was born about 1308.)
"He (John Drummond) is usually said to have died in 1373, but no evidence has been found that he survived till then. He is said to have married Mary Montefichet, the eldest daughter of Sir William Montefichet of Auchterarder and Cargill, and this seems probable, though there is no direct evidence."
1 History Scotland, Vol.18 No.5 September /October 2018 "Annabella Drummond: The Patient Queen" by Dr Amy Hayes.
e-books, The Scots Peerage ed. Sir James Balfour Paul vol. 7 (1910).