You need her husband's used plane ticket or boarding pass, to prove that he was here when she got pregnant.. that's not hard at all especially if she is less than a month pregnant, that means he just left. If he threw it away already just get the date and flight number, authorities should be able to check if her husband arrived/departed on that flight. If the baby is hers and her husband there shouldn't be a problem going to the hospital and inquiring about terminating pregnancy.. especially on the first trimester..
JhunBug