Yeah, I think the problem with the grip of the machette... I say this way too late and with the benefit of hindsight of course, but if you think of someone kneeling on their left knee but their right knee up and right foot flat on the ground (like NFL players knee for the national anthem) and then the machette in the right hand (blade out away from the body) going from left knee to swinging until the right arm is straight up away from the body - that would work. Like a tennis backhand shot but diagonal... that'd be a strong clean strike... but they way you've drawn it makes her seem super flexible and strong, so it's probably better anyway - I wouldn't have thought about it if you didn't write about it, haha.