If she is content to sleep in her basket after having been out for a short walk, I would go out myself while the dog was sleeping for a longer walk.
If she is still contentedly sleeping when you both come home again, well and good, You can then gradually accustom her to your being out for longer periods at a time.
If she is distressed when you try this, then obviously you will need to consider some of the alternatives others have suggested.
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