Earlier quoted context omitted.
You are filling in so many details that are not there. But whether that is correct or not is not the point. The point is, why mention it? Should we be surprised, or should we be impressed that an immigrant Muslim family was involved? I just don't know what the OP wants me to feel. It's touchy, but it is ambiguous. Is that good? Is that bad? Is it stereotypical? Is it challenging expectations?
I think the point is that there’s a human on the other side too, not faceless corporation. Rhetorically, the story works just as well if it’s a scary-looking guy in a biker jacket, helping his sister open a ballet studio, or someone clad head-to-toe in Rangers’ gear.
I think this illustrates the possible unspoken angle of the post. Is the post trying to show a surprising contrast? And if so, should I be surprised to see anyone, hijab or not, working in a family pharmacy store while also working on their MD?
With your example, a scary-looking guy in a biker jacket evokes a certain feeling (fear, worry, etc.), but then we find out that he's just a good guy helping his sister do something that's very unlike his nature - or the nature we would assume a "scary-looking" guy in a biker jacket would be about.
By this example, I would take it to mean that your interpretation is that a girl in a hijab is a scary person to worry about, but in reality she's just a good, smart, hard-working girl helping her family.
This is why I raised the initial question. These couple of extra specific details lead somewhere. I wanted to know where, because the perspective was not provided. The reader was left to make their own assumptions or draw conclusions. Based on your example, we see one conclusion: fear of people in hijabs, but that such fear is not appropriate.
I take the perspective that the hijab doesn't represent a special person nor a person to fear any more than a guy with a baseball cap on his head sideways means something other than "he likes to wear a cap in a way that doesn't block the light from his eyes".