It's not a Cold War at all because to Eleina's mind she's liberating citizens from a rule where the Lord ignored them. The red priests would preach right at the Stormland's border and not cross but what happens inside their territory is all Stormlands. And if asked to stop, Eleina would stop. =p Again, Dorne doesn't care, they're perfectly content to just stay in Dorne BUT, the Stormlands are veryyyyy tasty looking. And it all depends on how Garland reacts, if he shows that he's more inclined to let the Stormlands fall and bring them under the sisters via Dorne then El will invade hard. If he's more inclined to protect and such then she'll back off.