She had to wait for 2/5 years for her husband AP to be clear and then travel ban happened and she had to wait another two years because of travel ban didn't let her husband to come to USA. Not sure why this is hard to understand.
So what exactly did she sue over and how was she successful? She surely did not sue to overturn the travel ban because that would have made headline news.
Edit: ah, I see now that you posted the rest. She was successful in getting a waiver. That is not suing over the ban.... that is doing the workaround. You had said "I have heard one of people who sued Trump administration has got his husband visa after 4 and half years this morning." which is not accurate in light of what you subsequently posted.