She can't possibly be the daughter of Ralph Deincourt and Basilie Unknown with the dates shown. Disconnected until/unless souces can be provided.
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E > Eincourt | D > Darcy > Alice (Eincourt) Darcy
Categories: Unsourced Profiles
Collins Peerage of England PG. 397 https://books.google.com/books?id=4YXCXMz5pGEC&pg=PA399&lpg=PA399&dq=Lupiet+in+Gascoigne&source=bl&ots=mwY78EK3xt&sig=ACfU3U3kCZFeuog_15kL4oP70Ctj_b8kIw&hl=en&sa=X&ved=2ahUKEwiG96PJrKbnAhU-lnIEHT8NDL8Q6AEwAXoECAsQAQ#v=onepage&q=Lupiet%20in%20Gascoigne&f=false
Burke's https://books.google.com/books?id=YdIKAAAAYAAJ&pg=PA306&lpg=PA306&dq=Alice+Deincourt+thomas+darcy+genealogy&source=bl&ots=qFBjjZa82G&sig=ACfU3U2NM8b9Vxyx8l4qrI00v9LwjLOwAQ&hl=en&sa=X&ved=2ahUKEwjApu6Tn6TnAhX8mHIEHS6UAMQQ6AEwB3oECAoQAQ#v=onepage&q=Alice%20Deincourt%20thomas%20darcy%20genealogy&f=false
Extinct Peerages https://archive.org/stream/extinctdormantpe00clay#page/38/mode/2up
She married Thomas Darcy Lord of Nocton.
edited by Nancy Yeager
can not be the daughter of Ralph Deincourt (1180 - bef. 1234) ( https://www.wikitree.com/wiki/Deincourt-49) as she was born over 40 years before him.