Usually names are not translated and some do not have a translation as in this case.

Just Ashley. It does not have a Spanish translation as such.

This is not an answer, but I found it on the internet:

ASHLEY m,f English
Pronounced: ASH-lee
From a surname which was originally derived from a place name which meant "ash tree clearing" in Old English

Also:

The meaning of Ashley
Origin: Anglo-Saxon
Meaning: Dwells at the ash tree meadow.

Origin: English
Meaning: Lives in the ash tree grove. Derived from a surname and place name based on the Old English word for ash wood. Famous bearer: Ashley, the male character in Margaret Mitchell's popular 'Gone with the Wind'. Both a male and female name.

Since there is no Spanish equivalent to Ashley, if she wanted to have some fun and make a pun of it, she could use Cenicienta, which is derived from ceniza, "ash", and is the Spanish name for Cinderella.

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Note added at 2004-01-04 05:21:24 (GMT)
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I presume this is for Spanish class. Of course the ash of Ashley is the ash tree, fresno in Spanish, but unless she finds Fresno a catchy name, my original suggestion stands.