But she looks 20...women develop much faster than men, also;
The age of sexual consent  is 16 in; Alabama, Alaska, Arkansas, Connecticut, District of Columbia, Georgia, Hawaii, Indiana, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nevada, New Hampshire, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Vermont, Washington and West Virginia.
And 17 in NYC...however, she lives in the UK, wherein its also 16. I honestly don't see any problems here. She has the mind state and body of an adult...to be fair, there's plenty of idiots above the age of 18.