Not at all, and I hope the hospital appointment went ok.
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As already mentioned by HP, the 'file' you were attempting to attach in your screen capture, wasnt actually the MP3 music file, but the shortcut on your PC to that file. Shortcuts to files are considered unsafe by most email clients.
You should be fine though if you directly attach the original file rather than via the shortcut.
>> not sure my sister would cope with un-zipping it though.
Although I dont use it myself (been using winrar too long), I believe the integrated windows zip facility is very easy to use.
Its simply a case of double clicking on the file and letting 'windows zip' automatically doing it for you. The only thing I would recommend is that she saves it to say desktop first, so she can easily find the unzipped version.