Don’t. Tell her you can’t do that because of Fiverr’s terms of service but that it’s easy to download the files and look in Fiverr’s Buyer Help Center for the article describing how to do that and add a link to that.
The max you can do if she insists for some reason, is to tell her you’ll have to contact customer support then which might take up to two days to reply (perhaps she realizes then that it’s much simpler and faster to simply download her files herself) to ask them if they’ll make an exception - (which most probably they won’t if there isn’t any good reason for why she can’t simply download the delivered files like everyone else - this bit in brackets is just for this post, don’t tell her that ;)) and then you can quote support’s reply to her (or follow her plea and send the files by email in the unlikely event they’ll say yes).
Be polite, of course, do your best to make the conversation not sound like she should have known that, etc., many new buyers simply aren’t aware of even Fiverr’s biggest rules, but don’t risk your account for that buyer’s convenience.
If you do it, in the worst case, the buyer might decide she’d like a refund and go to support, who’d look at the conversation and see you did email her, or she might try to use the fact you did email her to blackmail you.
Chances are she just doesn’t know better than to bother you with this “dangerous wish” but we’ve seen it all here on the forum.