Shiny Puppy (Element of Fleas) No.42095295
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Cats are cats, and some are not keen on new surroundings. Leave some toys around see if she's come out to play with those. You can try those fishing pole style things to gradually get her closer and closer but don't force it. I had a friend get a feral kitty and that took a couple months before they became buddies. Now she's a needy purr monster.
Good luck in eventually getting a kitty pal.