We're talking about a person who, along with her partner, gives to efficient charity twice as much money as she spends on herself. There's no way she doesn't actually believe what she says and still does that.
That she gives more than most others doesn't imply that her belief that giving even more is practically impossible isn't hypocritical. Yes, she very likely believes it, thus it is not a conscious lie, but only a small minority of falsities are conscious lies.
Here's the new thread for posting quotes, with the usual rules: