Graendal can probably touch the True Power because Moridin has her soul in a Mindtrap and while we don't know a whole lot about the device, it could be entirely possible that a link is established between the soul held within the device and the person owning it. Obviously one can't channel when near the person holding it, and anyone with a soul in a Mindtrap is under the control of the owner as well.
WoT If...Moridin Is a Double Agent?
in Theory Blog
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Graendal can probably touch the True Power because Moridin has her soul in a Mindtrap and while we don't know a whole lot about the device, it could be entirely possible that a link is established between the soul held within the device and the person owning it. Obviously one can't channel when near the person holding it, and anyone with a soul in a Mindtrap is under the control of the owner as well.