The response is not recorded

Unfortunately, if a submission didn’t reach Microsoft’s servers successfully due to connectivity or server issues, there isn’t a way to recover that specific data.

Go to the Microsoft Forms portal and check the Responses tab.

Download all responses to Excel to see if her data somehow made it into the system but wasn't shown in the online response summary, sometimes, responses may not display properly in the response summary but could still be part of the dataset in Excel.

Responses are not stored locally on the student’s laptop; they are directly submitted to Microsoft’s servers. There is no option to recover answers from the device if the submission failed due to network or other issues.

To let the student try again, edit the form settings:
Go to the form settings by clicking on "…" (the three dots) in the upper-right corner.
Under Settings, make sure to uncheck "One response per person."
Alternatively, you can duplicate the form and ask the student to fill out the duplicated version.

If the student's network connection was unstable during submission, the form might have indicated that it was "submitted,"but the data might not have reached Microsoft’s servers.

Confirm that the student logged in with the correct account, especially if the form was set to only allow responses from specific accounts.
Make sure she used her school email address and not a personal one, which might not have the right permissions.

Ask user to clear it's browser cache as well.