I'm in NVDA at $7/share from 2008, but I don't have a huge amount of shares(200). I bought it awhile ago for a long, long term hold. Being 10 years from retirement is in an area that most people would recommend a migration to less volatility. It's all a matter of what her positions are and overall risk. Both of those need to match what she wants as risk.
I've thought about selling to get my initial investment covered, or potentially get that covered and then x% increase and let the remaining ride. If I did sell it, if I didn't have an idea of what else to 'bet' on, I'd probably divert it to a current holding or add another stable option. Regardless, investing is about what you anticipate the return to be after holding for x amount of time. Nvidia is giving a small dividend of 0.8% plus or minus any value change.
I've only bought long term holdings when the market was cut in half. I've essentially held them, adding to some when I see fit.
I'm basically in a bunch of dividend blue chips, then a few 'long shots' when the market was crap.The market could turn back to crap. I've started to add some low cost index funds to help round out everything.
Regardless of where you put your money, you are always losing relative money. The key is to find where you are comfortable trying to minimize your loses.
If I put it in a bank account earning less than inflation, my dollars 'saved' will buy less next year. If I hit a 'hot stock' I've lost because there's another hot stock that I missed out on because I chose the other one. If I choose a bad stock, I've lost even more.
A friend inherited GE at almost 50/share before the market as a hole tanked. It went down a low around 7. He never bought more shares and it finally is up to 31 today. It is giving a near 3% dividend so at least he got something while it has fallen, but it doesn't cover the entire loss. Point of this is that if you do keep it, set a sell price so you don't hold on to something for too long.