Well yeah, but ledgehop dair doesn't really guarantee any follow-ups, nor does it kill Samus, which is why it's not really very threatening.Ledgehop dair would work. It works on Sheik. But you're probably right about one of her hitboxes hitting you.
You can put her in a bad position by hitting her with tipper fair/dair/probably a bunch of other things, certainly, but I think keeping her away from the stage and trying to get her below it should be your top priority.