Hi all, 

I want to visit Thailand between 14-20 September and for that I have booked Flight and Hotel already. My girlfriend is in Pakistan and I am in Canada. Can I apply for her too from here in Canada? Or She/Her profile will be treated as separate entity?

You would not be able to apply for a visa for her. She would have to be in Canada to do the application plus have residency there to do an application.

She will have to apply for it at the Thai embassy in Islamabad or the consulate in Karachi.

There are at least two reasons why that will not work. First, those with Pakistani nationality must usually apply for Thai tourist visas in Pakistan. Second, you must be in Canada to apply for a tourist visa there. Anyway, unless she traveled to Pakistan without her passport, you presumably do not have it. Even if the Thai embassy in Canada were willing to help, they would be unable to stamp her passport.