This enemy has extreme distance Long-Range attacks, so try to prevent her advancing 1/5th of the battlefield as she will hit your base. However, if she hits your base, you still have a quite large amount of time to beat her, as Mina's DPS is pretty low for an LD enemy.
Alternatively, you can lure her to your base so that her attack hits the base without killing any cats that you deploy, however, in order for this to work, you have to kill the H. Nahs quickly and rush towards Mina before the Le'noirs and Sunfish Jones get in the way.
Forest Girl-based assassin was hired by dog corps. Use any kind of unfair trick if it is for the mission. A bazooka that can attack from ultra-long distance is used to snipe the Cat Base by this annoying Enemy.