I think your daughter is great, and one year for a girl is not maturity concern to me at all especially for a younger sibling who is so advanced. My youngest was always youngest in the class (right at cutoff) with some kids older than her by the whole year , but she is significantly more mature than her 2 older siblings.
Maturity concerns are usually for boys who are significantly younger. I remember a kid in GaTech at age 13 or 14 back when I was in college. That was wild among 19 and 20 years old in engineering classes. He obviously couldn’t connect to his classmates.
Focus on good fit in college for her more than prestige.
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