Thanks very much to you both for your responses. Still have a couple of questions though.
As BRBO said - there's 29GB of content in her iCloud. I really have no idea of what I am talking about so bear with me but looking at
<Properly Downgrading iCloud - download all of iCloud first>
I would have thought that ideally, I could download the iCloud content to her iPhone not an external HD which I do not have. Is that feasible as I would be much more comfortable with that option not to mention not having to fork out for an external HD.
<downgrading your iCloud plan is the way to go. Note that this has a monthly fee>
What? I want to cancel, not downgrade so there shouldn't be ANY fee. I realize that even with a cancellation, I still get 5GB of iCloud space.