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She was Mrs Joan Palmer, not Joan Jordan. There's no evidence as to Mrs Joan Palmer's maiden name, or the name of her previous husband (the father of her daughter Priscilla).
Thomas Palmer, his wife Joan Palmer, and his stepdaughter Priscilla, are listed on the 1624/25 Muster at Jordan's Journey, along with 55 others in 15 separate musters.The Palmers' residence at Jordan's Journey doesn't indicate that they were related to Samuel Jordan.
Thomas Palmer's stepdaughter Priscilla married John Baker, whose 1636 patent (Land Office Patents No. 1, 1623-1643 (v.1 & 2), p. 352 (Reel 1) mentions his three wives, including number two wife Priscilla, and his mother-in-law Joane Palmer.