Martha Wachtel worked during the day yesterday for her family's New York City-based shoe business, Head Over Heels.

Last night at the Capital Centre, during the second phase of competition at the Washington International Horse Show, Wachtel was head over heels after her first international jumping victory on her horse, Sweet Lullaby, in the $7,500 Eisenhower Cup.

Wachtel was the only rider in the field of 35, which included top foreign and U.S riders, to go the two rounds without fault. It was the second time in as many events that a rookie has won here.

"She jumped incredibly well," said Wachtel, who was to get up at 6 a.m. today to return to New York for a day of work as a shoe buyer. She will be back here tonight for another event.

In other events, the Cismont Manor Farm, with headquarters in Keswick, Va., took three blue ribbons in the hunter classes. Rider Charlie Weaver, who began his career in the local circuit in Fairfax, won two jumping classes.

Weaver, 32, of Charlottesville, won on Two For One, owned by Mrs. Haywood Nelms, in the regular conformation class and on Double Call in the regular working hunter class. Double Call is owned by Cismont Manor Farm and the Greenes.

"Two For One has had a month off," Weaver said after his back-to-back victory. " . . . This is his first time indoors this season. He jumped spectacular."