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Overall I kinda like the shot. I've made my living shooting musicians for the last thirty odd years and have more than my share of guitars in photos. The headstock on this being cut off is not a big deal unless you're advertising the guitar, and in this case, I'm pretty sure you're not. The only place I'd like to see some breathing room is at the top of her head and maybe between the heel and lower bout, which is just a bit close to the frame edge.
The lighting is quite nice, but it almost looks like the point of sharpest focus is slightly behind her eyes. In a shot like this, you really don't need a lot of depth of field, so maybe opening up to f/2 or 2.8 and making sure the focus was exactly on her eye, would separate her just a bit from the chair and really put the focus, so to speak, on her.
And seriously, I'm not seeing any appreciable so called wide angle distortion in this shot. The head stock looks completely normal. It's barely coming at the camera at all, and certainly not enough to make a difference. It is a small body guitar suitable for someone that size, so the head and neck might look larger to some, but it's not because of the lens.
Maybe have her playing a nice barre chord next time. Her left hand should probably be doing something that makes sense from a playing perspective. But overall - a nice start with very nice light and beautiful tonality. Good job!