Lights travelled silently, very fast toward the setting sun

I'm a 58 year old widow, walking my dog with my 89 year old mother who was walking her dog. I saw very bright white lights that travelled toward the setting sun. Bright as a welder's arch. They were silent, moved too fast for a plane or helicopter. East to West with a slight arch. Not very high in the sky. My view was intermittently blocked with a row of Italian Cypress. I'm not sure if the lights were a reflection of the sun or if they emitted light. Not sure if it had a tail or if there were more than 1 traveling in sequence. Lots of air traffic in the sky.