Sus, you appear to be under the impression that this area is specifically covered by legislation - it isnt, the nature of what was claimable at the time is covered by the
Green Book and is overseen by the
Department of Finance and Administration, and the Committee on Standards and Privileges. Both of those bodies will probably exonerate her (indeed the DFA did pay the bill), for the simple reason that she was probably safe to claim for it along with everything else she claimed for (she is allowed to claim under ACA for "telecommunications services", fittings and furnishings, "repairs" and so on)).
As Oborne says, this acceptance and lack of consequences for obvious pisstaking - as shown here, and in the cases of Conway (who only paid back a fraction of his "mistaken claims"), Spellman (ditto), Trend and everyone else - is probably enough to demonstrate that the system is actually working as they intend it to work.
I appreciate this is probably obvious, but I am not saying that these claims are in any way acceptable morally (I mean ffs under the ACA as it was they could claim for a TV licence), just that under the system that they devised they are legal.