Because Mrs. Stone wouldn't go for it.
4 seconds sound clip from the Lady Gangster movie soundboard.
You can hear this line at 00:42:59 in the DVD version of the movie.
Quote context
[...]
- Mr. Phillips told Mrs. Stoner that you know where the money that was stolen from the bank is hidden.
- Yeah. And he also said that before he'd approve your parole, you would have to tell him where it is.
- So that's his game, all he wanted was the money.
- Wait a minute, if Phillips wanted to make such a deal, why didn't they send for Burton?
- Because Mrs. Stone wouldn't go for it.
- That doesn't sound like Stoner.
- Why didn't Mrs. Stoner call me in to face that heel?
- No, 'cause when Mrs. Stoner refused, Mr. Phillips didn't want you to know that he suspected you.
[...]