I have quite a bit of experience of this. It is true there is no need to contact anyone, & that all the debts included in the application are written off.
However, some creditors are very inefficient. I've known cases where the written off debt has been chased quite a long time after the 12 months has elapsed - either by the original creditor or by a debt collector acting for them. (If a creditor fails to write off the debt it can stay on the books for ages, so any chasing can occur months or even years later.)
My advice is to go online to the Insolvency Register immediately after 25 July, find her entry, print it off & keep it permanently (the entries are taken off the register after 3 months). Also, keep permanently a copy of the original application listing all the debts included. (If she doesn't have this the DRO intermediary who dealt with her case should be able to provide a copy.)
If she is then chased at any time in the future she can produce these documents to prove that the debt was written off in the DRO.