You gave your wife access. After it you lost money. This is the basis for initiating a case. Even if she doesn't understand computers, she caused you damage through negligence. Let her pay you compensation for damages
Pay with what? A “divorce”? And then the kidsif they have any will live in a broken home because of a situation that could have been resolved without cause more harm that has already been done. It’s a husband and wife thing if she’s an understanding person she could agree to support the man with what she has since he has lost a significant amount (it’s still not known if she’s the cause, because she was the last person to operate the computer does not automatically mean she did the error) and their relationship will continue to grow as usual rather than looking to file for her to pay damages.
Its too early to assume the wife did it without carrying out a proper check on the entire system.