Catherine had rounds of 77, 76 and 74.
Local lady Mary Smith (Tain), was runner-up on 229 with scores of 77, 75 and 77.
And another Scot, Sheena Wood (Aberdeen Ladies) did well to tie for third place on 230 with scores of 80, 73 and 77. On the same mark were Spain's Macarena Campomanes (78-80-72) and Lulu Houseman (Highgate) 78, 77 and 75.
Campomanes' final round was the lowest score of the three-day tournament.
Leicestershire's Helen Lowe (Scraptoft), clear leader through the first two rounds with scores of 71 and 74, had a disastrous final day of 11-over-par 87 for 232 and finished joint sixth..
Defending champion Ann Lewis from Wales finished on 234 with scores of 75, 77 and 82. Also on the 234 mark was Royal Dornoch player Alison Battlett (81-79-74), the Northern Counties LGA secretary.
SENIOR BRITISH WOMEN'S OPEN AMATEUR STROKE-PLAY CHAMPIONSHIP
Royal Dornoch Golf Club.
LEADING FINAL TOTALS
Par 228 (3x76)
227 C Rawthore (Sale) 77 76 74
229 M Smith (Tain) 77 75 77
230 M Campomanes (Spain) 78 80 72, Lulu Houseman (Highgate) 78 77 75, S Wood (Aberdeen Ladies) 80 73 77.
232 M De Orueta (Spain) 73 79 80, H Lowe (Scraptoft) 71 74 87.
233 C Utermark (Germany) 78 79 76, A Mayne (Saltford) 73 79 81, P Cornett (USA) 78 73 82
234 A Bartlett (Royal Dorncoh) 81 79 78, S McElroy (Grange) 79 77 78, A Lewis (Royal St David's) 75 77 82
235 J Brown (Trentham) 82 80 73, S Dye (Delamere Forest) 84 74 77, C Berry (Bromborough) 79 77 79
236 L Lloyd (Hayston) 77 79 80, R Adams (Royal Blackheath) 80 77 79, M Castillo (Spain) 73 80 83.
SELECTED SCORES
243 K Russell (Royal Ashdown Forest) 76 79 88, P Doran (Donabate) 79 79 85 (T32)
244 A Glennie (Kilmarnock Barassie) 81 79 84 (T34)
TO VIEW ALL THE SCORES CLICK HERE
