At this point, Buffy doesn't care if it's a permanent fix. They can work on reinvigorating the seed of magic once Dawn is solid. There's a great deal of hope in her expression, also some tension and anxiety, but those will be dealt with in time.

She leans forward on her elbows, moving close enough that she can look over the book as well, her shoulder pressed against Angel's. She might not understand all the writing in the book, but she wants to see it. She looks at him, smirking at the very bad joke. "No. I want you to use me." She wouldn't want Dawn's life tied to anyone else's. That would quickly turn her into a basket case. "What do I need to do? Besides not die again."

Hell if she knows, but she's surprisingly comfortable with it. She trusts Angel, even now after everything, she trusts him and she wouldn't want to willingly put her sister's life in many other people's hands.