It appears that she did not.
With an L tube it would not be that detrimental, as your basically hand feeding a chimney.
You can dry stack a J to start but it really will do better if it is sealed from air leaks.
One part clay and 3 parts sand makes a fine easy mortar.
I recommend 100# sacks of commercial builders sand from home D. (no rocks) Apx $11 a sack
Dry clay is easiest to mix . Bagged dry clay is premium but drying
local clay then smashing it into a powder works as well.
Getting the rocks out is the most important.
You can dry stack and then just smear any old mud over the outside to seal it up.
Be kinda funky looking but it would work.