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It will always report a bal, however with Amex what ever they used on the card that month has to be paid in full. Is there a CL attached to the card?
Yes, TU98 includes it in utilization.
Thanks for the response Guiness. Do the other TU models count charge cards in Util?
The only benefit of this AU account for me would be for backdating purposes at a later date if I get my own AMEX card. It lowered my AAoA since it was reported as opened in 5/13 and atleast on the TU 08 scoring model its hurting my Util.
If I have my sister close the account now would I still be able to get AMEX to give me a member since date of 5/13 when I apply for my own AMEX next year?
It seems like my best course of action is to just get this account off my reports. If she removes me as an AU do we need to request that AMEX remove the reporting from my CR?

Only TU98. All other models, including EQ Beacon 5.0 ignore it in utilization. TU08 shouldn't factor it in.
If you are removed it will either be removed or a comment such as consumer relationship terminated.