As his shoe connected forcefully with her chest, she felt the strength that his body possessed, a strength able to send her tumbling backwards through the doorway, her barely able to maintain her grip on her diamond weapon during her jarring trip. However, while the kick was strong, her body was more durable than the average human so it hurt her but did not do any severe internal damage. 

He would almost surely have noted her unexpected weight when he knocked her back. She was infused with diamond, after all, so weighed 655 pounds at the start of this battle, only weighing less by what she had fired off and what was in her sword. This meant that, to move her in such a way, he could clearly work with weights at least that much. Most men had trouble budging her more than an inch.

She now found herself on her stomach when she came to a stop. She pushed herself up into a kneeling position, her right foot and left knee on the ground, before going up onto both feet should she get the time, while her sword was aimed with the point just past the doorway to serve as a decent enough defense for any rushing attacks he might attempt to get to her. Once her left hand was free from pushing herself up she would begin to emit diamond from it as well to form a circular shield that would expand slowly but surely for however long he gave her up until it was 2 feet in diameter and 3 inches thick at the center, tapering off to thin, sharp sides. She'd want it to be bulletproof if she was to stand a good chance at deflecting his full power.