from what ive seen happen to people i know - the girl needs her parents/guardian's consent only if she's muslim and if it's her first marriage. If she's been married before and this is her second or third etc then the parents consent is not mandatory.
If the woman is christian - regardless of whether she's marrying a muslim or not - no parental consent is required.

Oh and if the bride and groom are not muslim - a civil marriage certificate is issued as opposed to a sharia one.

ok im out!

"He who reigns within himself and rules passions, desires, and fears is more than a king."