Pet issue 😢 please help

Ok, my I have ran out of ideas. With the influx of women with cats and female veterinarians, this is a last stitch effort to figure out what to do. My sweet kitten is 4. She started on dry food, low grade, she was a rescue. I've been here mom since she was 2 weeks old her mom abandoned her. She's the sweetest, she potty trained in the first month, she's the smartest cat I've known. But for some reason I have had to deworm her so much in the last 2 years. She was getting into my mother's cats food and it was leading me to believe that was the culprit ($2 cats food isn't exactly what they require) so I switched her to wet cat food(2 years ago ), expensive but whatever, anything for my binxx. She snubbed her nose up at it and still tried to eat the horrible corn garbage. Well We have 2 other cats and after getting into our own home we switched them to nutro max, binxx kept getting into it and I was worried. For a few weeks she had no worms, thinking we FINALLY found a dry food her sister (not related they're both adopted lol clearly ) would actually eat and she could digest without worms "hell yea give her the nutro!" Yesterday she had worms AGAIN! I'm at a loss of ideas. I don't know what else to do for my sweet girl 😢 can someone please help me help her? That cat saved my life and I hate not being able to find anything that will keep her tum happy.