Hi! I'm new here and hope no one gets offended but here I go. Ideally, the kitty should be kept 5-7 days before adopted out. Post flyers at vets offices, the neighborhood, etc. Chat with the neighbors to see if they may have seen kitty before. They may know owner or they may know that kitty has just been hanging around homeless for days or longer. You did the right thing by first and foremost getting her off the street. Given my experience, in my community, she would most likely have been a throw away and our local shelter has very very few cats or dogs reclaimed by their owners. Also some newspapers will run lost and found pets for free as a community service (ours does).