This is from the 1st century CE, when Romans ruled ancient Egypt, but Egyptian funerary beliefs and rituals were still followed.
This is almost like a portrait of the woman who this cartonnage was made for, so she's depicted wearing her finest jewelry.
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The heavily gilded mummy mask is an especially ostentatious demonstration of the owner's wealth. You may have noticed that it looks quite a bit different from the other mummy masks nearby.
This woman's clothing is distinctly Roman, but this object serves an Egyptian religious function (to adorn the mummy). The blue eyebrows are a surprising and telling detail.
The ancient Egyptian believed that the gods had hair made of lapis lazuli, a blue stone. The woman's blue eyebrows tell us that she hopes to join the Egyptian gods in the afterlife.