While I think there's some truth to this, she doesn't get it until she's 60 and it's $725/month. She makes $174K now and has plenty of access to legislative information that multiplies that many times over.
I don't dismiss it entirely, I just think too much has been made of "oh, she stayed to be eligible for a pittance of $725/month." I can understand that as she got close to the date, but nobody saw this happening a year ago, and I don't for one second buy, "Well, she went to Congress to get that $725 pre-tax a month money when she's 60."
(Side note: Gerald Ford nowadays is generally considered a decent and honorable guy compared with what we've seen but when he was running in 1976, his finances were investigated by special counsel in the wake of Watergate. The special counsel didn't find anything wrong, but he also found that the Ford's somehow managed to subsist on $5-$13 per day, a difficult task even half a century ago for a House Minority Leader.