Sally, originally from South Queensferry but whose family home is now Elie in Fife, tied with 18-year-old French girl Celine Boutier on three-under-par 141 for the No 1 spot.
Sally had rounds of 72-69, Celine 70-71, so the card comparison gave Sally, with the better second round, the No 1 seeding.
The only other Scots to figure among the 64 match-play qualifiers were:
Rachael Watton (Mortonhall) on 152 (77-75).
Young Jessica Meek (Carnoustie Ladies) on 153 (82-71). --- The 17-year-old who came off the waiting list at the last minute on Tuesday because she was local and ready, willing able to step into a vacancy that came up. Her 71 is a record by a Carnoustie Ladies GC member.
Renfrewshire County Champion Alyson McKechin (Elderslie) on 157 (82-75) also made the cut.
Alyson now plays Curtis Cup Team player Bronty Law in the 1st round tomorrow.
CLICK HERE to see the draw.
BRITISH WOMEN'S OPEN AMATEUR CHAMPIONSHIP
Carnoustie links.
MATCH-PLAY QUALIFIERS
Par 144 (2x72) SS 79 79 CSS 79 79.
141 Sally Watson (Elie and Earlsferry) 72 69, Celine Boutier (Fra) 72 69.
146 Amy Boulden (Wal) 73 73, Daniela Holmqvist (Swe) 72 74, Giulia Molinaro (Ita) 70 76.
147 Bronte Law (Eng) 73 74
148 Holly Clyburn (Eng) 75 73
149 Perrine Delacour (Fra) 72 77.
150 Johanna Tillstrom (Swe) 76 74, Brittany Marchand (Can) 78 72, Vicki Troeltsch (Ger) 79 71, Isabel Gabsa (Ger).
151 Charley Hull (Eng) 76 75, Alex Peters (Eng) 72 79, Emily Taylor (Eng) 76 75, Gabrielle Cowley (Eng) 78 73.
152 Ariane Provot (Fra), Josephine Janson (Swe) 78 74, Rachael Watton (Sco) 77 75, Meghan Maclaren (Eng) 79 73, Sophia Popov (Ger), Kyle Roig (Pue) 76 76, Brooke Henderson (Can) 76 76.
153 Marita Engzelius (Nor) 79 74, Jessica Meek (Sco) 81 72, Meghan Stasi (US) 74 79, Anne Van Dam (Net) 77 76, Manon Gidali (Fra) 76 77, Lauren Taylor (Eng) 81 72, Marina Stuetz (Aut) 75 78, Hayley Davis (Eng) 75 78.
154 Laure Castelain (Fra) 75 79, Augusta James (Can) 79 75, Georgia Hall (Eng) 78 76, Anna Young (Can) 77 77, Christine Wong (Can) 75 79, Ann-Kathrin Lindner (Ger) 79 75, Sara Monberg (Den) 78 76, Marta Sanz Barrios (Spa) 75 79, Patricia Sanz Barrios (Spa) 73 81.
155 Olivia Winning (Eng) 81 74, Amanda Strang (Swe) 80 75, Noemi Jimenez (Spa) 78 77, Nina Holleder (Ger) 80 75, Laetitia Beck (Isr) 76 79, Rachael Goodall (Eng) 77 78, Jisoo Keel (Can) 76 79, Justine Dreher (Fra) 80 75, Isabelle Boineau (Fra) 75 80, Nathalie Mansson (Swe) 78 77
156 Kelly Tidy (Eng) 77 79, Stephanie Meadow (NIr) 81 75 Claudia Chemin (Fra) 80 76, Camilla Hedberg (Spa) 79 77, Noora Taamminen (Fin) 78 78, Kerry Smith (Eng) 74 82, Emilie Alonso (Fra) 78 78.
157 Alyson McKechin (Elderslie) 82 75, Nina Muehl (Aut) 86 71, Leona Maguire (Ire) 73 84, Myrte Eikeenar (Net) 79 78, Fanny Vuigner (Swi) 81 76, Roco Lobato (Spa) 81 76.
158 (after card countback) Emily Taylor (Eng) 83 75.
SCOTS THAT MISSED THE CUT
158 Laura Murray (Sco) 79 79.
159 Susan Jackson (Sco) 84 75,
160 Megan Briggs (Sco) 81 79
161 Jane Turner (Sco) 79 82, Kelsey MacDonald (Sco) 82 79
163 Ann Ramsay (Sco) 82 81.
166 Ailsa Summers (Sco) 84 82
170 Gemma Dryburgh (Sco) 85 85.
