Instead of giving Shyvana more ratios...
...why not make let her passive proc when she becomes a dragon too.
Maybe not at the same rate of 5 armor/mr each time (Because I'm not sure how much that'd end up being over say a 30 minute game), but at least some. Then it'll actually be a passive. On top of that it would reward her ganking in between jungling too, instead of just her usual style of only farming.