what is the meaning of this se3ntence?

[princehamlet]

"woman, your mistress then returns this purse of forty thousand crowns, is it fifty thousand? come name the sum will buy me grace of her."

what is the meaning of "will buy me grace of her?

[Pompey Bum]

It means: will be enough to win her favor or get her to do something for me. It's perhaps ironic, since favor and grace are not supposed to be things that require payment.

[ennison]

Sounds right PB but it would help if our noble Dane would give us more context