Hi bro Bahnoo,
Sorry bro !! I think i'm not in the position to advise you on this matter. I've never come across any case related to WL in sg.
Like I told you over the phone sometimes back, DON'T ever register your marriage in s'pore but in Thailand. You will thank me for that if you follow my advice.
I think if your yearly income is sufficient enough (above 24k/annual), you shouldn't have any problem applying for 1 yr visa for her to stay in sg.
My 2 cents.