Husband Barry was on duty as a fireman, so she was looking after their children, 11-year-old Emily and one-year-old Logan.
"We just wanted a horse to have some fun", a giddy Thomson told The Associated Press, with a glass of champagne in her hand. Emily was screaming on with us and Logan was clapping because we were clapping.
"There was never a doubt he wouldn't ride the horse as long as he was fit enough".
"He will probably go up a few pounds for that".
Celebrations in Liverpool are also lively.
One For Arthur carries the colours of The Golf Widows. I kept thinking barring accidents, he would win the National and he has.
Russell's evening exploits were a touch less adventurous.
"Right at the beginning when we bought this horse we asked the owners did they want to win the Gold Cup and the National and we all agreed on the National".
Walsh had only failed to finish the Grand National on three occasions from his previous 12 attempts, and it was a miraculous recovery at the 25th fence that ensured he didn't make it four.
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Thomson said: "I just can't believe it". With their partners spending most weekends on the golf course, they made a decision to get into the horse-racing business. I felt we'd done everything we possibly could to get this horse here.
Owner JP McManus let him keep the ride in Saturday's Aintree spectacular and Codd did not let him down, enjoying a fantastic first ride in the race by finishing a clear second behind One For Arthur.
One of 10 children brought up by their father after their mother died in a auto crash, she said from an early age she would ride the victor of the "race that stops a nation".
"It's brilliant here, we love it", adds fellow owner Belinda McClung.
Assistant trainer Peter Scudamore said the win showed Scottish stables could compete around the UK.
Definitly Red and Vieux Lion Rouge were neck and neck in the early morning betting ahead of the 38 other runners in the world's most famous steeplechase. He was unbelievable and took me everywhere. They must be as delighted as I am that he's won.
Everyone seems to have backed Arthur, including Richard and Tracy Lewis from Kinross, who have come along with their children James and Ruby.
We will see what happens but I would say that the cross-country race at Cheltenham will be his long-term target and then we will take it from there.
Down the row from Arthur's box, Peter Dunn and Moira Hunter from Cowdenbeath are giving Sky Khan a pat.
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