FYI.. This is not a realistic application of the low blow technique. However, it is a realistic concept of one of the applications for that type of block dealing with certain kicks. What makes it an unrealistic application is that the lady is in a bow stance when the kick is done. A possible problem that exists below is that the person blocking is at risk for having the elbow kick. One would think that the toes would be hurt from kicking the elbow, but if you put shoes on then it's easy to understand that shoes will win (Jow Ga kicks each other with shoes on so trust me on this one). In a free sparring application there will be a considerable amount of movement and not much time to pose in a bow stance. You can also see that the guy would be able to still connect with the kick. When this technique is done in horse stance, the center of the body is far from the kick due to the stance. So even if the person misses the block the kick won't land. The risk of getting kick in the elbow will always be there which is why using the correct angle matters. From what I've experienced the higher up a person is in the stance the greater the risk of having the elbow kicked. There's a nerve on the inside of the leg where she is striking. I won't say where it is, but she's missed it .
Just some comments from my perspective. And I am not saying your style is wrong. Every style, and school, can pick their own way to do things. If they make it work, that is all that matters.
First, when I studied TKD, the guy doing the kicking would not have been wearing a BB. Long before attaining a black belt, a student would have been taught not to unbalance themselves while doing a kick.
As to an elbow being kicked, there is always a danger of being injured when blocking a kick or punch. Since there is more power generally in a kick, there is more danger there. However, since I was taught to block by having the arm straight at the moment of contact, I would think a kick to the elbow would be unlikely, for me anyway.
I don't think her stance is wrong, but more in line with step sparing. As you allude to, it is not so likely to be done in free sparing. But it is possible if she is anticipating his moving his kicking leg to his rear, and she intends to step in and punch.
I don't know what pressure point you are referring to, but the one I am most familiar with, she looks close with her wrist. But I would think that dangerous. Why not the fist or a sudo hand? BTW, is she trying to grab his ankle? That would be to me an awkward start of a block or grab, but I am always willing to learn something new.
Again, just my observations from my TKD days and subsequent Hapkido training. Seeing the techniques in a moving shot, rather than in that still shot, might show something different and my comments might be different. And if you think I am off base, please tell me how and why. I have always had a lot of respect for the Chinese arts and think they have much to teach us.