[US] Is my friend the victim of a Brazilian romance scam?

Mark, a Texas resident, is in a long-distance relationship with Marie, a Brazilian woman he met on Bumble. Marie communicates exclusively via a translating app, avoids video calls for Leo, and insists on meeting in Brazil despite Mark's father offering to fund a flight to America or Europe. Red flags include Marie's irritation when advised to limit late-night texting and her refusal to meet outside Brazil, though no money exchange has been confirmed.