I guess a lot depends on how important it is and the type of information - is it just text or is it documents?
If it's documents, you could use some sort of secure uploading site like Dropbox and then grand temporary access - that way you'll have an audit log of access and can revoke it at a later date and delete the files. That's only part of the issue as it also means your daughter will need to treat the files securely at her end (i.e. not saving them).
If it's just text information, you could use something like Whatsapp and then either of you can delete the message once the information is no longer needed.
At the end of the day, the information is only as secure as the weakest point - so securely zipping files, sending via PGP e-mail etc... is great, but only if it's stored/opened/deleted securely at the other end.