I thought Rabona was in the middle of the continent and so immediately accessible from anywhere else.
Jara: He's not under her tutelage... he's her bitch and she keeps her bitches clean. The current Clare SHOULD be able to take him out considering each's abilities. Hell, the only reason nothing worked was because she didn't release any youki in the first place while he was in his full awakened form.
tldr: SHE DIDN'T USE ANY DAMNED YOUKI.