I can't forget her excitement when she won the first prize.
I'd like to see if the underlined clause is an adverbial clause or an adjectival clause which modifies her excitement.
I can't forget her excitement when she won the first prize . It's neither an adverbial clause nor an adjectival one; in fact it's not a clause at all. In modern grammar, "when" is a preposition.
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I can't forget her excitement when she won the first prize.
It's neither an adverbial clause nor an adjectival one; in fact it's not a clause at all.
In modern grammar, "when" is a preposition. The underlined element is thus a PP (preposition phrase).
More specifically, it's a PP in a fused relative construction.
It has a paraphrase containing a noun