There is a possibility she got refused for a few reasons. You need to establish a good reason to visit, enough money to spend for the duration, usually around 20k baht, and a good reason you will return. Some SE Asian countries require that to enter as well.
I am not sure about visa extension as I am on DTV and I obtained it myself. My comment was in regards to opening bank account. I did extensive research and found two reputable agents in Pattaya. I don't live there but I was willing to go there. They both said the same thing. So I gave up trying to open a bank account.
I don't what you talking about, but it's funny you use the word " fraudulent ". Agents has these services posted all over the place and have offices. If they were fraudulent, they would all be arrested by now.
in Canada, depending on the province, you are allowed to use any drivers license from another country for 3 months. I personally known guys who used their UK license for a year. Unless you get stopped by the same cop after the 3 months.