She said so publicly, but she never shared that much power with Bill.
They even told us upfront what they were up to. She was the other half of that "Two-for one, Blue-Plate Special."
Interestingly, when Bill complained about having too many photo-ops, Hillary gave him a couple hours in the afternoon for him to kick back.
And then in walked Monica.
When Hillary graduated from Wellesley her one desire was to "marry a senator," which would give her the power she craved. All she had to do was find somebody's back to ride into power and she found Bill.
I have read all the bios about the two of them. It is safe to say that she is the only first lady to do the work of an unofficially semi-elected president.
Our Founders, in all their wisdom, prepared for everything, but they never even thought about making a provision for an evil, conniving first lady.