She didn't put any money into it it was my hard earn money that I had to risk.
That's the most important part here. She has no basis to demand that you sell something that she's not legally entitled to. It's your money and entirely your choice what to do with your investment. The thing is, I'm pretty sure she wouldn't like to hear the truth about her not having any say in this. I understand that the situation is complicated and your goal is to avoid escalation. So why don't you try an approach where you show her something like this:
In March 2010, 1 Bitcoin was worth $0.003
In March 2011, 1 Bitcoin was worth $0.83
In March 2012, 1 Bitcoin was worth $4.92
In March 2013, 1 Bitcoin was worth $47.41
In March 2014, 1 Bitcoin was worth $662.57
In March 2015, 1 Bitcoin was worth $200
In March 2016, 1 Bitcoin was worth $382
In March 2017, 1 Bitcoin was worth $1290
Now onto March 2018, 1 Bitcoin is currently worth ~$8000, don't you see a clear uptrend here,
honey, why not give it another year?
There's historical price data available on a large number of sites, I'm not pulling these numbers out of my ass. You can show her charts and use the March example. If you have food on your plate and are able to pay rent & bills, then this is a further argument to present against selling now.
I hope it helps, and I hope you're able stand your ground without any turmoil in your marriage. Good luck.