Of course, short vowels were not affected by the GVS.  Here are a few notes on some changes to short vowels that appear in the dialogue

that and Ann
In EMnE, ME short a became æ.
 

	ME	PDE
"Ann"

 

wonder and of
The U in "wonder" and the open o in "of" became schwas.

	ME	PDE
"wonder"

Check out all the changes in the words  |  What is PDE?