Baby always fights sleep 😵‍💫6 months

I’m slowly going insane. She’s always been this way but now it’s gotten way worse. During the day she fights naps to no end, until she’s so overtired she’s fussing so bad wacking her arms and basically pulling her hair out and rubbing her eyes.I try everything! We have white noise, fans, black out curtains, I rock and nurse her. Try singing, try her swing, try walking around. I can be trying for hours and hours. She doesn’t like a sling. The only thing that always works is a car ride but with price of gas and snowy conditions I can’t keep doing it. At night the same thing. Fights bed for hours! She’ll wake up soon as I put her down. She’ll wake anywhere from 5-15 times at night. Seems like as soon as I fall back asleep she’s crying. I’m exhausted. HELP

Edit to add: she does have a dairy intolerance to which I avoid as much as possible. I drink non dairy milk. Cut out cheese. I’d say I’m 95% DF but still eat some ‘hidden dairy’, if it’s baked into a muffin or something. She has been gassy lately and been trying some purées. She has a dr visit tomorrow I’ll ask them questions. My son has dairy intolerance but he was soy formula fed and I never had these issues.

She also seems to be teething so maybe that’s the culprit? Lots of drool and chewing everything. Rosie cheeks. I’ve given her baby tylenol but I feel like it hardly helps.