An interesting question. I could not tell you the precise answer. There are cases when it's more fragile than a clay figurine, but sometimes it's not. For example, if it falls down, it won't break. But pressure leaves marks on it. So generally you should protect it from pressure, not breaking. I'd better not try to say any percentage values.
I know you've probably already thought of this, but if you ever end up making another Luna in this same position, I'd tilt her neck and head forward just a tiny bit, so she's not leaning back so far. I think she would look a bajillion times more regal if you did so.
She's so pretty, though. I love the paint you used for her mane
Thank you and thanks for the advice, but I made her intentionally into this positure. This is a proud pose fitting a princess. I will not sculpt her this way, the high selling price is the result of the fact this is a completely unique sculpture, and it wouldn't be nice to just create her in this same form again.