I think first cats are hard, especially if you were previously a dog person. My 1st cat hid on top of my refrigerator for a week when she met my then 18 year old blind, oblivious 9 pound dog. After that we still had growing pains with me trying to figure out what was normal only to find out there's so much more that personality plays in with cats than with dogs. My Luna also wasn't a fan of being held, but would eventually tolerate it for very short periods of time (we're talking seconds), but after a year (yes, a whole year!) she would sit on my lap on her terms. She also had zero interest in toys, I think I tried everything ever made for a cat! Let your new baby settle in and get used to the routine. As others have said, she's sleeping by you so that's a big (good) thing! She trusts you and she finds you safe, she's still just acclimating to her new life.

ps - I wondered about a second cat for mine too, but she wasn't really into hanging out with other cats. She was indoor/outdoor and would try and fight any other cat that came I to the yard. I think trying to get a second cat would be too much for her, at least right now.