Imagining how Ina would move is actually a really scary/disgusting endeavor. Her human parts are just little dangly bits on the hughe tangle of tentacles. Around humans she probably keeps the dangly bits in front and close enough to the ground for her "feet" to touch the ground. Keeping the tentacles tight together on the ground, moving them in small, snakey movements. Trying to keep the human part steady and level at all times. Trying to hide that she is actually moving around half a ton of demonic flesh. In combat I imagine her doing the inverse of the fighting game concept. She'd keep the human parts off the ground, safely surrounded, on the underside of the tangle, and move like an octopus "walking" along the bottom of the sea.
Then there is the question of her mouth. There is no way she is getting enough fuel through her human mouth to maintain those enormous tentacles. There has to be another opening, somewhere.