Being a bit pedantic here but her statement wouldn't and couldn't be leaked 'by' the DM - it'd been leaked 'to' the DM who have authenticated and verified it to the point they are assured to publish.
Having said that, I don't think we have seen the leaked statement anyhow have we? We've seen snippets of info from LE and we've seen phrases quoted from EP being doorstepped by journalists but regards the alleged statement EP made to LE via a lawyer, we haven't seen that verbatim or even quotes of have we? Apologies if I'm incorrect.
I doubt LE would 'leak' info to the DM unless they're doing a controlled game of cat and mouse and certainly no way would her lawyers disclose a private and confidential document they prepared on behalf of a client, unless it was prepared as a Press Release (ETA someone up thread states it's been published, I wasn't aware).
I'm not much of a fan of the DM but oddly when it comes to legal / criminal cases they're really much better than any other UK based mainstream media as they do fact check, they're like a dog with a bone and they go in deep and relentlessly. They often drop hints or clues that usually transpire to be correct (and not the other way around) so they must get a lot of informants, maybe they pay them for info.
There's cases I've followed on WS where the DM have been far and away the best news resource.