Pre packaged creme fraiche in quiche
Creme Fraiche is more comparable to sour cream than it is to heavy cream, and it sounds like what you have is if anything even further from cream. You could certainly make a tasty quiche with it, but it would probably require the addition of additional liquid, and there's a chance it won't turn out well. If you're OK with risks and experimentation, go for it!
Otherwise, I'd suggest using it for something you'd usually use yogurt, sour cream, or cream cheese for.