Will doing a masters from a not so renowned university affect her career or job prospects in UK?

It depends. A master's from a less renowned university can have some impact, but it does not automatically limit your career or job prospects.

Employers in the UK and globally often prioritize your skills, experience, internships, and how you apply your knowledge over the university name. Top-ranked universities may offer stronger alumni networks and more on-campus recruitment, but many graduates from less famous universities succeed by building their profiles through internships, certifications, and networking.

Your career success will depend on how you leverage your education and opportunities.