Can you get a feed from their in-house system? Or have them provide you with a copy of the recording that you can just sync up with your footage?
any on-camera solution is going to leave a lot to be desired quality wise. You could always mic her with lav and use that...though the dynamic range of a lav isn't typically very strong. If you can't get a feed from their in-house board (or a copy of their recording of it) I would probably lean towards the lav on 1 channel and some sort of on-board mic (Rode or AT) for a bit more ambience and backup recording to track 2....mix in post as needed.