easy.... just have a quick chat with her on the phone ask her how she is etc, say its weird being on your own after being in a realtionship etc, then invite her round, offer to cook her somthing and a wine and dvd night.
she`ll come round, relax around you and then want to fuck because she is free and lonely.
its that simple - tried and tested -- if shes not up for it bin her off and ask her to give you a shout if she wants to hook up-- just dont be gay and be her agony aunt