This story is a sequel to Life is Very Complex
After Twilight Sparkle lost her parents due to being sent back to another reality, she feels great sorrow and guilt for what her parents are going through and the fact that she misses them. Though this is not the end of her journey as she will gain friendship and even family and possibly even a new purpose.
Is this still just a crossover with Korra, or is it crossing over with other shows now?
It's still a crossover with Korra the issue is Twilight will now go through a great many things before she returns to that other universe where this timeline of legend of korra is.