Let me start by stating that I am a novice at this. According to "A genealogical and heraldic history of the extinct and dormant baronetcies ..." by John Burke, John de Kingston, Lord of Kingston only had one daughter. Her name was Eleanor not Elizabeth. Eleanor de Kingston married William Drew. That was the end of the de Kingston, Lord of Kingsdon. The manor passesd onto the Drew family where four generations later it passed from Alice Drew to the Meux family through her marriage to Lodovick Meux. Is this information correct???
Well, although this will undoubtedly throw a 'wrench' in one of my ancestral lines, I did find corroborating evidence to the above statement in A genealogical and heraldic history of the extinct and dormant baronetcies By John Burke, page 350. https://books.google.com/books?id=K1kBAAAAQAAJ -- yet, further searches continue to show Elizabeth as daughter to John....though, the above book mentions that Eleanor married a male other than John Malet!
Thus, I have added this new information into my personal genealogical database, yet shall keep the wench to question the wrench, until such day as undeniable truth arises or is uncovered.