from my imagination it could be like this:
-hwayoung wanted to leave t-ara because of her health issues like what she stated before bcoz of her pelvis
-other members didn't seem to agree thus led to some conflicts among the 5 and hwayoung
-other members replied hwayoung's tweet because they don't like the idea of hwayoung leaving because if she leaves, t-ara would definitely loses popularity-that's why hyomin tweet of different level of determination and eunjung added, you need to care others around you and more.
-hyoyoung defended her sister because of she loves her and maybe she really is sick
-t-ara turned to hate hwayoung even more since she might destroy t-ara's future
-when fans started to hate t-ara, hyomin post the photo of theres a reason behind everything
-KKS stated hwayoung has attitude problem
-hwayoung felt angry because she's sick and it is not because of her attitude thus replied-facts are wrong
and it also could be like this.. the same flow as above but different issues-which is hwayoung can't stand to be in t-ara anymore because of the hard schedule. + she's not close to any of t-ara's member = worsen her mental depression on further schedule
ACTUALLY i hope it's not about bullying..but somehow it could happen..because we don't know what behind the scene
for whatever reason i want to stay still from being a hardcore fan of t-ara for a while(means i wont buy their album or singles like i usually did) until the situation becoming clear..
i don't support bully.. if they did bully i will not like them as i really like before unless they apologize.
i'm a hard fan of t-ara-i bought all of their album except lovey-dovey japanese single.. but bully is a different matter.. if they apologize and show how sorry they are then i will start support them with all my heart again..for me, even if hwayoung is really a bad person bully is not the answer especially for someone in the age of 23 and above...
i hope t-ara + hwayoung can give a full statement about this issue or else they will lose many fans..