I have seen few posts on other forums where "petite" 5'3" owners complain that the front headrests does not come down enough.
My wife is 5'3" and she haven't complain but I guess it is individual feeling.
Anyways, I played around with ideas and what would be feasible solution and...
One quick is to order 2 additional rear headrests and replacing front with rear.

NOTE: Rear does not lock to front as the locking groove does not match but if you know how to use angle grinder then this is not an issue (or find someone who knows how to use it)