You can do it on her behalf. The key is that you need show she will return after visit, A letter from her employer. Show she owns house if possible. Show you have funds to keep her , overkill on the Info you give
Do thru the uk government web site not agent ! The key bits are. Answer ever question Put prof on every question. If she works get a letter from her employer saying she on vacation. If she own home show this. What they are looking for is that she will return after, that you have enough money to support her, With the gov agency it’s a tick box situation so overkill on info , bank accounts savings etc Took 3 weeks to get a 6 month multi entry. Then 2 weeks to get a further 2 year multi entry
I got 6 month in 3 weeks. The. 2 year multi entry took 2 weeks. The key is to overkill on all answers. Show she will return after visit. Like letter from her employer. Show she had job. Show she had gone to done bzck too show you have enough money to keep her. It’s long winded. But if you answer questions with lots of paperwork. It better than little or none. It’s normally done by outside agency and is a tick box job. You need make sure you can tick all boxes
You need to get a letter from her employer. You need go overboard with all the answers. One letter short and be refused. I got a 6 month to visa for gf. Then took 2 weeks to get 2 year multi entry visa.