I would interpret it as: BD-CE-BD-C(alone)-BD. This follows directions and saves you from having to include the A and complicate the fingering. As far as rhythm - I would do the grace CE as 16th note along with the low G, and the turn/trill as four 32nd notes along with the LH high G and D, with the final BD as a 16th note, along with the LH B.