I'm not sure how I'm meant to know any of that, Alias. It would just be guessing from either side. I highly doubt she moved after that first shot, nevermind actually fired another. The no signs of tears part is just strange and not sure what you're trying to get at with that.
I am not really expecting you to know all that. It was just that scipio claimed with great certainty that he knew how she sat and how Jeremy held the rifle (at the hip) - I can´t see there is room for that, especially with the silencer fitted. I would like to hear from him how he imagines she was positioned for the second shot.
I asked guilters in general, because since you think Jeremy shot her, you might have an idea how it happened. I think this is important.
I agree that she must have been sitting for the first shot, but I think she may have sat on the bed, "leaning into" the rifle (sans moderator), which was resting on the floor. I think she must have leaned forward/to her right side and put her hand/wrist to the wound - you can tell that from the blood on her right arm; than she must have slumped to the floor. She must have been conscious after the first shot, otherwise those blood-trails would not be on her arm.
She could also have been in a sitting position on the floor, leaning against the bedside cabinet - in that case, there would have been enough room for Jeremy. It would still have been an awkward position for him to shoot her in, can´t quite see it. The shot had an upwards angle.
I don´t think it is strange to think that a natural reaction from her would have been crying. She is at gunpoint in a blood filled room with the disfigured, bloodied, dead body of her mother was! Imagine the sight, the smell!