it is an unfortunate fact that people will immediately jump to the obvoius conclusions .. and, as thailand is featured heavily in matters of sex-tourism, and child prostitution,not surprising.
you and your partner seem to have developed a very good relationship and it can only be a good thing that you have liberated her from the dreadful life she was leading.
bottom line - if you talk about her to others you must be prepared to hear some 'jump to conclusion' remarks - it is up to you to either dismiss them or politely put people straight.
the alternative is not to discuss it, although i get the impression you want to talk and are not easily embarrassed.
finally, from me, i could not care how or where you met - you have fallen in love , and that is all that matters. i wish you both long life and happiness together. may you both be blessed.
E