My mom's mood swings are making my home life unbearable

Some days my mom is genuinely the best. Warm, funny, interested in my life. Then something shifts and suddenly everything is wrong. She's cold, critical, distant. A day or two later it resets completely like nothing happened. No explanation, no acknowledgment. Just back to normal. I've spent so much energy trying to predict which version is coming so I can prepare. I'm basically monitoring her constantly and I'm exhausted. I started thinking about how much of my own mood was being controlled by hers. The good days almost made it harder because they kept me hoping and kept me blaming myself when things went cold again. Like if I could just figure out what I did wrong I could fix it. But there was never anything I did wrong. The shift happened regardless. I realized I'd been treating her moods as information about me. When she was warm I felt okay. When she went cold I assumed I'd done something wrong. But her emotional state wasn't actually about me. I'd just been so close to it for so long that it felt like it was. We agreed the best next step was to start noticing every time I caught myself monitoring her mood and redirect that energy back to myself instead. Not ignoring what was happening at home but stopping the automatic habit of making her state mean something about me. Just naming the pattern made it feel slightly less like something happening to me and more like something I could start to see clearly.