In fact, I did email Jess. This is what she wrote, "Hi Krista,
Wow, that's a new one on me! I've never had it freeze for any reason, but DON'T use heat to defrost it, as heat will kill the preservative. I'd just set it on the counter and shake it every once in a while until it's thawed. It MIGHT separate as it thaws, which would not be cool, but again, I've never frozen it so I really don't know. Sorry I can't offer more help, but please let me know how it turns out. "

I did just leave it on the counter to defrost. It was pretty well defrosted by morning. It seems to have separated a little wee bit, but it still worked just as great as always. WHEW.
3B
Have had my hair short for almost a year now. No regrets! Still loving it!