I have dealt with Yaten before and she's always 
been awesome.  If you ordered 300$ worth of art 
from her (WOW) then you must have ordered a ton 
of it.  Art takes a lot of time, especially if 
said artist has a life and doesnt sit and draw 
24/7.  I honestly dont know how people have the 
time to do commissions, it boggles the mind.  I 
barely have time to do my own art, let alone 
commissions for everyone else.  Anyways, I think 
you've jumped without looking here, things do 
happen, she may be busy on your art.  I know 
that keeps me from many an email.

Secondly, I saw where someone said that maybe 
you offended Yaten or something.  I have heard 
through the grape vine that your art requests 
tend to be somewhat...well, for lack of a better 
word, X-rated?  I know of at least two other 
people who have told me this, and they werent 
too keen on it.  Might want to watch that..most 
artists wont accept those types of 
commissions..at least most female artists.  Good 
luck.