aah that's a difficult one for you- speaking as a parent of an emigrated child, we have a duty to wish you well & be pleased that you're such confident & well-rounded individuals up for adventure. In practice of course it's not so easy ! There's a thread running on this very subject on the PomsinOz site; you might find it an interesting read .
And rest assured she'll come around to the idea even if it takes a while- needs must. Is there a plan for her to visit you at some point? However far in the future it would give her a great trip to look forward to/save & plan for. And tell her we all get used to Skyping/Facetiming etc, they are great for keeping in touch . All the best, she's obviously going to miss you .