Momina's hair gets easily messy, and it's why she has a tendency to run her hands through her hair a lot. She will pull and stroke her bangs without thinking.
In fact, Momina is someone who can appear rather sloppy despite her fashion sense. She can't seem to get her bows or ribbons straight. She pulls on her sleeves, and her shoelaces tend to get untied. She is also a messy eater despite also being very motherly/nurturing. It can paint a conflicting image.
Kyoko is someone who takes it upon herself to adjust Momina's appearance. She sees her brother in Momina, and it initially leads to her to Momina. Although her eventually adoring Momina is also because of who she actually is.
Another who ends up fixing Momina's appearance is Hayato. Unlike Kyoko, he doesn't ask permission and kind of just does it while scolding her. "How'd you even get the bow like that?!" Momina, who can be petty, will sometimes go: "Sorry, dad...!" Which only angers and embarrasses Hayato. It especially annoys him because Momina never reacts like that when Kyoko does this. She simply thanks her and gives her a big hug. [I wonder why the difference in treatment...!? Clearly a mystery...!]
Jojo and I like thinking that Haru ends up in the same high school as everyone else, and so she ends up picking up this habit with Momina as well. Hayato and Haru fuss over her the most, with Haru going as far to wipe and dab at Momina's face for her. It embarrasses Momina but because she knows she means well she doesn't really say anything. [However she does tell Miruku later over the phone. Sobbing, "these two girls at the Cafe snickered at me after Haru did that!!!"]
Parentified and infantilized at the same time... truthfully, this is one of the reasons Momina's favourite person is Miruku. Miruku understands Momina's health issues but doesn't infantilize her. Always listens to her and is understanding of her anxiety and [over]protectiveness as well.
I've gone on tangents but wanted to speak on why Momina's hair tends to have messy strands strewn about or her ribbons are loose and angled funny. If I could draw shoes properly her shoelaces' bow would be verticle!!