The Complete Peerage in various volumes, also has her mother Mary as having no known parents, and the unsourced statement that she may have been from Scotland.
I think she needs to be unlinked as a Bohun (as there appears to be no evidence for them as her parents). changed to Unknown and her biography discuss/mention the two possible theories.
Meanwhile back at Alice's biography, as well as a clean-up, the section copied directly from Charles Cawley's Medieval Lands database needs to be either deleted or used as a source for the information it contains and appropriately cited. I haven't actually checked that it comes from his database, but it certainly looks like his style, and copying the citation numbers as well as the text is a bit of a giveaway.