Unfortunately there's nothing you nor she can do. She was ticketed to fly from Vancouver, BC to Monterey, CA not San Francisco. Before she left the airport in San Francisco she should have discussed her plans with a United ticket agent. When you skip any portion of an itinerary, except the last of course, the remaining segments are canceled. It's part of the contract of carriage and by walking away in San Francisco that contract for this ticket was broken.
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