you should be able to email them direct to her kindle , via amazon's personal documents free service - each device has a kindle email & a list of who is allowed to send stuff
( she would need to find and manage this info on here manage your kindle amazon page after logging into amazon web site.
once your email is on the approved senders list & you know here kindle device email address, then you just email direct from calibre to her Kindle.
( I have never looked at calibres' email-out facilities but I think it has some ! )
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