Helena was the lead scientist of HAMMER, well respected by her colleagues.

Spoiler

When they kidnap Ushio, Asako, and Tora, in order to study the full capabilities of Ushio, Tora, and the Beast Spear, a piece of Hakumen no Mono comes alive and devours many Yokai HAMMER has in captivity for study. Helena is gravely wounded during the battle but she stays to monitor it in order to gather as much data as possible for her colleagues. Asako assists her until Helena convinces her to leave before the facility self-destructs. Asako also learns from Helena that she had a son named Paul who died despite scientific advancements, and in her final moments, Helena thinks of her son and dies with a smile on her face (having succeeded in compiling and sending sufficient data to her colleagues).

(Source: Wikipedia)