Witching hour sending me over the edge

When does it end?? I’ve tried really hard today to swerve it, my little girl only cat naps maximum half an hour, even in the carrier. Then 5pm hits she goes mental. I tried a late nap at half 4 today but she woke up after ten minutes. It’s really taking a hit on my mental health. I have a toddler at home as well and I’m struggling to cope. Anyone else going through this. I’d thought they would grow out of it by now, it seems to be getting worse. She is three months. Unless it’s the sleep regression.