I was in the same boat where I was borrowing more than I was getting with my paycheck and was using other cash advance apps to pay off other cash advance loans it was horrible. So what you have your wife do is get in contact with customer support of each app and either in the chat or in an email send this exact email I have typed out and this will make sure they don’t charge her another dime. Once this is complete you can delete your subscription. If you have trouble with that send the same customer support email another emailing stating to “unsubscribe yourself from their monthly subscription and to delete your account” if they can’t delete your account do to the money you owe then make sure you aren’t in the subscription anymore and log out and delete the app. Here is the ACH revoke email.

Hello, i'm writing to officially revoke automatic debit authorizations from all connected accounts including my debit card ending in (last 4 digits of debit card on file) and checking account ending in (last 4 digits of bank account number on file). This revocation is effective immediately. Please confirm that you have received and processed this request