I would insist in receipts being given and all travel arrangements be followed. If there are any deviations she pays for them. Determine a policy (stay at the venue, etc.) for what is covered by the state and what is not.
Don't follow this and then she's gone to far.
Don't get me wrong. She's not been good, just not so bad to boot her out. You can see it from there though.
That done, direct parliment to our own very real problems.
I'm not sure if there's going to be a policy on venues. It's very hard and subject to a lot of circumstances. Yes, Harper is very controlling of his party caucus and will try to make sure Oda or anyone else does not make a stupid mistake like this again. But they've always defended some of their extravagant airline fees (helicopters, fighter jets among other things). It's just that this particular instance was indefensible.
Something we should note here is that the Conservatives did not defend her until after she apologized. That means whatever she did, there's no excuse to it, or at least nothing that the party could try and sell. That's pretty bad, considering Harper's history of vehemently defending his cabinet ministers.
You said earlier that she would pay for it in the polls. I disagree. If she messes something up in her own riding, she will pay for it in the polls. She is apologizing and all, but the reality is that the party is making her do it. The Conservatives are in damage control, but this is different from last time. Last time she screwed up, they defended her and they were willing to pay the price. This time, they made her apologize straight up. Her leash just got a lot tighter, and I'm tempted to believe that she's been given a THIRD chance because of she's a female minority. Because let's face it: she REALLY sucks as a politician. If anything, she should go or at least step down (that whole poor people thing and the 17 dollar juice looks really bad on her) as minister, for the party's sake.
I know I'm taking a different approach to this (Scorpio Ego will accuse me of being complacent towards the political games), but she is an idiot who will probably screw up again. Nobody wants someone like that, or at least not in the public sphere or at the front bench.