Here's the portion of Shirley's interview where the money issue is discussed....
YM, "But there are, there are certain things that, and that your son brought up, and that I remember Cindy mentioning at first, although now she's kind of going back on it, that are important."
SP, "About what hon ?"
YM, "About, well about Casey stealing from family."
SP, "Yeah"
YM, "And taking so much that they had to go into their 401k."
SP, "Oh well she's telling me now that uh, she did the 401k thing because, a few years ago she had a problem with George."
YM, "Well we know about the problem with George."
SP, "Okay"
SB, "We know about the problem with George."
YM, "Yeah"
SB, "And it didn't have anything to do with the 401k at this point."
SP, "No. But I mean she said she had to you know, pay a lot of those bills back."
YM, "Yeah, but what, what was the first reason she told you she needed to get into the 401k ? Was that it, or was it because Casey was stealing a lot of money that they were, they were going to lose their home again ?"
SP, "Oh, well see she never told me any of that stuff because she'd known I had my hands full worying about Dad."
YM, "True, true"
SP, "So, uh..."
SB, "She first, she first told you, what you told us a minute ago, she first told you it was about trying to pay the bills off that Casey had run up."
SP, "Yeah"
SB," And then she told you later it was about George ?"
Then, Shirley goes into talking about all the money George has lost and then SB asks this next question...
SB, "When, when did she change, when did she tell you recently that she was doing it to pay off George's stuff ? Was it, was it just since all this has happened ?"
SP, "Yeah, since it, since Rick was telling all of this."
http://www.docstoc.com/docs/5048266/Casey-Anthony-Shirley-Plesea-interview