In reply to Dawes of Time:
No, unfortunately it isn't unalloyed good news and doesn't seem like she's quite out of the woods yet. She made the same statement in person at the airport that appeared on her instagram, and it seemed equally likely to have been made under duress. (She figuratively, almost literally, had a minder twisting her arm behind her back as she spoke.)
Apparently she was then taken away in a van and I don't think it's entirely clear where she is now.
If you have been following events at all, you must be aware that what's going on in Iran more generally right now is most definitely not some sort of mere media confection.