Given his powers of persuasion, maybe she's having a little attack of conscience?
Throwing the decision back to the states changes it from a 1/1 to a 1/50 matter. That would be huge.
At 1/1, it's easy to say "It's legal, therefore it's ok."
At 1/50, it gets a leeeeetle bit harder to say that.
Attack of conscience.
The Supreme Court never said abortion was "legal". The court went way, way beyond that and declared abortion a "Constitutional right". They based this ruling on an emanation from a penumbra. Almost everybody with the faintest of law backgrounds has been shaking their heads over that one for about 35 years.