But she was talking about covering the hair. She was talking specifically about covering the hair. If you examine the material in the post, it ties in directly specifically to what Sheikh Assim Al Hakeem was saying. I think you didn't watch the video.
No it doesn't as it's a discussion of why the face should be covered as well and the ustaad states the argument for it ie it's the most appealing feature of a woman. I think you are conflating this entire discussion all together, to begin with this was not a discussion about which features are the most appealing but of adhering to the commands of hijab.
Hair is part of a woman's awrah and this is why they are required to cover it, the girl didn't understand this. Despite acknowledging the reasons for covering other parts she didn't adhere to it as well, so in actuality the issue isn't about understanding the underlying reason/hikmah but of submission.
A heart that is not ready to submit will not, even if the individual recognises and understands the reason behind the command. Allah has commanded women to cover their hair and there has to be a good reason for it. This was my main point walaal