Yeah, that’s right she’s not worthy of becoming a Descender yet because she’s still bound by fate. I’m not talking about whether Skirk might eventually break free from fate in the future or not we simply don’t know that yet.
Yeah, that’s why Surtalogia wants to free Skirk from the chains of fate so that she can overcome it later. This implies that, for now, Skirk is still bound by destiny, which proves that the fate governed by the Heavenly Principles doesn’t apply only to the people of Teyvat, but also to those who come from beyond Teyvat, like Skirk.
Yeah, that’s one of the reasons why Skirk can’t become a Descender for now she hasn’t met the requirements yet, such as being free from fate, being able to rival the world itself, and possessing the power to destroy or create worlds.
here