One reason for her actions was, of course, curiosity, but mainly, she wanted to find a suitable partner to remarry because after coming back to her country, besides a few thousand US Dollars from her ex-husband, she had nothing.
Moreover, she wasn't very old, had no children to burden her, and was quite beautiful. Looking for someone with a certain emotional foundation, whom they both understood would undoubtedly be more suitable among former classmates.
Unlike primary or middle school, university classmates were more worth her attention. After all, being in the same class for four years, and able to get into Technology University, they undoubtedly had a high IQ, decent education, and common topics with her.
Otherwise, marrying a Beautiful Country "study abroad" girl to those nouveau riche without any education or culture, she definitely wouldn't be willing.