PCOS + gaining muscle mass diet

Hello! I have a question about nutrition regarding PCOS and muscle building. I am at my goal weight now (I’m 120 pounds after a year of hard work) and I’m diagnosed with PCOS. With PCOS I function a lot better with a ketogenic diet, it fights the fatigue and brain fog PCOS gives me, amongst other things. But I keep reading that you can’t build muscle while in Keto/with a Keto diet. So I’m wondering if anybody has any recommendations about PCOS nutrition in regards to GAINING muscle. I’m not trying to lose weight at all. But with PCOS, high carbs and high GI food is a big no, so m fairly confused. I just wanna build a bum and be healthy. Please let me know! Thank you!
PS: I have no idea why it says my age is 48. I’m 22. Lol
PSS: I am on metformin and birth control if that information helps

by emmadilemma22 via Bodybuilding.com Forums - Female Bodybuilding