ANSWER: If they commited zina, then they must first repent sincerely, cut all communications, wait until she gets her menses and then he can propose to her father and get married. https://islamqa.info/en/answers/87894/he-wants-to-marry-a-girl-with-whom-he-had-a-relationship

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ANSWER: There is no specific dua for this. Make istikhara once you have made a firm decision and if there is any good in it for you, Allah will facilitate it for you.

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ANSWER: She must not have any communication with this brother whatsoever as he is a non-mahram to her. If she convinces her father and he does not give his consent, she must move on and forget about him as any marriage without his consent would be considered invalid.

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ANSWER: Are you going to marry her or compete with her? You should overlook the height if she’s a righteous Muslimah who would bring up your children in an Islamic way. 

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