What is the allusion in this passage?

Question

Sunshine on the snow glittered so fiercely that, even though she wore sunglasses, Monica was forced to squint. The fresh snowfall of the night before was just enough to brighten the dull, dirty, diamond-hard snowbanks along the ribbon of highway that loomed as far as she could see.
Her head ached, she mused, as fiercely as the snow glittered.

Ribbon of highway

Mused

No allusion in passage

Diamond-hard

Please help me I only need this one question right. I can't miss anymore. Thank you!

Answer 1

I see metaphors and lots of descriptive wording, but I don't see any allusions.

http://dictionary.reference.com/browse/allusion?s=t

Answer 2

@Writeacher Thank you! I got it correct!

Answer 3

Very good!