Interesting.
This could be years worth of work to sort - but if you are interested enough and determined enough it would be great to get together as full a tree as you can for your Elizabeth and also for Tim B-T 's Mallawotnots and see if they do link.
As I say I am sure they do - but whether or no trecords will survive that show it remains to be seen.
For example , there is a large well researched De Boo family tree back to Holme near Peterborough, that my husband descends from. Another De Boo researcher has a comprehensive tree that he comes on, also going to Holme, but as yet there is no evidence of a link - I am sure there is though. This is back to 1700's. Now in 1600's there is documentation of De Boos coming over fromFlanders to Thorney - hmmm maybe 20 miles at the most away from Holme. now we are pretty sure that both these lines of DeBoos probably descend from those settlers - but there is just no surviving dicumentation to confirm it.
You may find something similar with your Malla....s