Just to clarify - I personally don't hide my BTC from her, if anything I wish she would be into Bitcoin too!
I'm just curious if anyone's partner has suddenly "woken up" to the value of Bitcoin and demanding you cash out immediately, perhaps after listening to the MSM and thinking it's some kind of bubble or ponzi scheme...

You should start listening to news that tell you the whole truth about Bitcoin. Bitcoin is not worst than fiat currencies. It's much better in my opinion. This is one of the most important things you need to let her know. Its price behaves alittle like gold... and it even has more purposes than gold.
I guess you should print out some fine bitcoins on paper to make them look like fiat currencies, maybe she will be convinced quicker if she could feel the fancy papers lol.
The "deflation" is as useful as other features of Bitcoin. So it is not a bubble nor mlm
I totally support you on this:
I personally don't hide my BTC from her