Ilse's Notebook
Ilse's Notebook OVA (subbed)

OVA “Ilse’s Notebook” “Iruze no Techō” (イルゼの手帳) Release date: December 9, 2013 lone survivor of a Survey Corps expedition, Ilse Langner, is running through the forest after her squad was killed and their horses dispersed by Titans. Making matters worse, her 3D Maneuver Gear was irreparably damaged, leaving her defenseless. 

If you guys are still looking for Ilse’s Notebook subbed, here’s a link I came across!