Got off work and had 2 missed calls and a text from SO telling me to come home. I get home and I can…

Got off work and had 2 missed calls and a text from SO telling me to come home. I get home and I can hear my daughter screaming when I get out of my car. I get inside and my SO is on the couch near tears with our daughter in his arms. She had been screaming for the last 45 minutes or so and nothing he could do helped. She's finally calm and falling asleep but I feel like a terrible partner (because i couldnt come home when he called and needed me) and a terrible mom (because she gets like this sometimes and i don't know why).