The 15-year-old from Woburn looked as though she would run away with the title after she opened up a five shot lead with one round to play. But she eventually secured the victory by just one stroke.
Charley scored 79 in the last round while runner-up Lucy Gould of Wales made up ground with a 75.
Charley shared the first round lead with Curtis Cup player Holly Clyburn, when they both scored two-over 74, against a CSS of 77.
The teenager then moved out on her own at the top of the leaderboard with an excellent level par 72. It was bettered only by England girl international Alex Peters who had a best of the tournament 71 to move up the table.
The best score of the final round was 73, returned by Rachael Goodall (Heswall) who shared sixth place with Alex.
Leading final scores
Par 216 (3x72). SSS 76. CSS 77 76 78
225 Charley Hull (Woburn) 74 72 79.
226 Lucy Gould (Bargoed) 77 74 75.
228 Amy Boulden (Maesdu) 76 75 77..
230 Chloe Williams (Wrexham) 78 76 76, Becky Harries (Haverfordwest) 76 76 78.
231 Rachael Goodall (Heswall) 79 79 73, Alex Peters (Notts Ladies) 81 71 79.
232 Elizabeth Mallett (Sutton Coldfield Ladies) 80 75 77.
233 Charlotte Ellis (Minchinhampton) 80 75 78, Hayley Davis (Ferndown) 78 76 79, Holly Clyburn (Woodhall Spa) 74 80 79.
234 Hannah Barwood (Knowle) 79 79 76, Hannah McCook (Grantown on Spey) 81 76 77.
Full details: www.golfunionwales.org
