Either she is actually recognized by the higher-ups and considered the asset to go to for this kind of request when its an emergency.
Or that higher-up is a bad boss.
@PlanOfInaction odds are said boss can't help with the task at hand, and is discouraged of staying overtime for moral support when his overtime pay is likely quite high. Hopefully he did ensure some benefits out-of-frame tho, such as food deliveries/accepting receipts of her eating out, and maybe even some kind of apology-benefit (would be sleazy of him to invite her to dinner despite it being the go-to thing bosses apologizes with in manga, but he can surely figure out _something_ she desires that they can put on company-expense).
He also probably had to OK the other girls overtime too (even if her ability to help is questionable), so he probably cares enough.