Does L2 become invalid when L1primary gets GC

I am on L1 and my wife is on L2 and both are in US. I had filed for my GC alone and am about to get it in some time. My question is what will happen to my wifes L2. Will it expire when i get GC. What visa types will she needs to get. Does she have to leave US since her L2 becomes invalid. Can she go back to India and come back to US on L2. How difficult will it be for her to stay here in US and get Green card later

Her L-2 will cease to exist once you move to green card. Can’t you include her as your dependent when applying for I-485?