"Are you -" One look at Castiel's face tells her the answer - he's certain, and he's going to do it whether they help or not. Closing her eyes and taking a deep breath, she zeroes in on Castiel's power and imagines her own winding around it, making it swell, almost double. She's not there yet, but the surge in power will be tangible.

She's holding back a little bit, though. She doesn't want to be drained of power when it comes time to heal him.