I translated most of it but not completely sure what Murasa is saying in the last bubble. Is she just thanking begrudgingly?
Updated
You'll fall if you make too much of a racket*raining*My mom has come ♪EheheThis might be pretty goodRain, rain ♪
fall, fall ♪Kogasa is singing a Japanese children's song called Amefuri. In the song, a child is with his mother while it is raining and they spot another child who doesn't have an umbrella. The child decides to give their umbrella to the other child and shares his mother's umbrella.Thanks for that.