The fact that you married a girl you barely know not withstanding....
Sex is complicated: Long lasting physical desire comes from emotional attraction and being happy within. So tell us more about your relationship and her stage of mind.
Do you have a happy, loving relationship? No teething problems? Have the two of you meshed well and without issues still waiting to be solved? Is she homesick at all? Has she got new friends where she lives now? A job?
And for what it's worth, emotional issues which stop someone wanting sex aren't excuses - they are reasons. When one uses the word 'excuses' it sounds as though they don't believe what is said to them.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.