We needed to download a new piece of music software, but before we could her computer needed to be on the latest update of the system software. (Ahem, ahem, who has not been doing their updates, then?)
And that was when the fun started.
There was not enough disk space to download the update. So we deleted some things and it downloaded and started to install.
However - then it said there was not enough room to install the update, and got stuck in a loop that we couldn't break out of.
The solution? By a bigger hard disk and either fit it or get it fitted by our friendly local independent Mac expert. The cheaper option was to get them to fit it, so they did, this morning.
And all is well again, with the storage space on her computer now doubled!