Another two suggestions are ...

the "Fantasy Warrior" hair by Pretty3D here at RMP, where the pony tail can be made extremely long.

http://www.renderosity.com/mod/bcs/fantasy-warrior-hair/89444

 

Or the "Rhene Hair", which can be found over at DAZ. Also with extreme "make-long" morphs.

http://www.daz3d.com/shop/rhene-hair

Tho, I have no idea how the state of the DAZ online store currently is, as I read a few posts about some issues over there, since their relaunch.