We've seen Jade's eyes flare up a couple times before. The first time was before the incident with Claire and Jillie, while the second time happened later, while she was in the quantum realm or whatever.

While what exactly is going on is unclear, what is apparent to me, and I hope to you, is that this is Jade digging into her mana reserves more aggressively, consequences be damned. She likely knew she was going to have to do this at some point during this ritual. Maybe not quite this soon, however. The first time she did this, it burned her out from using magic, and the second time she used that power to cause time to reset completely.

I have to imagine that creating a magical artifact like this in one ritual has to be extraordinarily draining, but for some reason she needs to do it this way.