I'll give you guys a hint that I don't think you've picked on, probably because you guys haven't fought many Zeldas, since there aren't THAT many of them out there:
You cypher, she Din's. You guys know this, this is obvious.
After the Din's hits, your only option is to cypher again, which she can Din's again.
The Din's won't kill you. Zeldas know this. Killing you, through power or gimp, isn't the point of the Din's barrage.
The point is that enough Din's will refresh her moves. Namely, her USmash. This move decays a lot since they'll use it to rack up damage. When this move is fresh, though, it's her best KO move. You don't want this move to be fresh, since it's a ridiculously easy move to land on just about anyone.
Also remember that you Snakes always go for a high recovery, always being above Zelda. Well, Zeldas WANT you above her. That's where she's at her best. If she can't land a lightning kick on you, then you'll get Din'sed precisely to force you to go above her, since Din's sends you up. You should know that it's never safe above Zelda.
Also, they have a Dsmash. It's one of the fastest in the game and it boasts great strength. Why does this matter? Because it sends you downwards off the stage. This is when they'll go for a lightning kick. As soon as you cypher after the Dsmash, you become lightning kick targets and a fast Zelda would be capable of capitalizing on that.
Just tossing that out there.