Mrs Paton had contrasting halves of three-over 39 and Sree-under 32 for a par round of 71.
She bogeyed the fourth, fifth and seventh before birdieing the 10th, 17th and 18th.
Eilidh Briggs (Kilmacolm) was runner-up with a 75 (37-38) and Joanne Free (Gullane) third with a 76 (39-37).
71 G Paton (Montrose)
75 E Briggs (Kilmacolm)
76 J Free (Gullane)
77 H McCook (Grantown on Spey)
81 E Hale (Troon Ladies), L Macgregor (Falkirk)
83 K Wright (Stranraer), L McClymont (Milngavie)
87 D Young (North Berwick)
88 A Hanson (Glencorse)
92 G Kyle (East Renfrewshire), S Wood (Drumpellier), L Lloyd (Hayston)
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