If she doesnt meet the SQA entry requirements as stated on each course page, then for those Unis it'll be a rejection as they are exceptionally competitive.
Examples from other Unis -
Liverpool - Engineering - Advanced Highers with grades AAB including Mathematics and a second science
Bath - Mech Eng - AA in two Advanced Highers including Mathematics and Physics and Highers at AAAAA
Leeds - Civil Eng - AA at Advanced Higher level, including Mathematics, and AABBB at Higher level.
Manchester - Materials Science and Engineering - AA in Advanced Higher in 2 subjects from Maths, Physics and Chemistry plus min BB in Higher Level.