I think it is normal. May I know when the line 3 of your minor is added? Before line 3 was added, the first page of her ecas show "Application received" or "In process"?
I am not sure when it get updated, I was not checking her account regular, I saw it yesterday but it might have updated in the last week anytime since last I checked like 7-10 days ago.
Originally there were 2 lines:
1.We received your application for Canadian citizenship (grant of citizenship) on October 16, 2017.
2.We sent you correspondence acknowledging receipt of your application(s), and a study book called Discover Canada on November X, 2017.
Then they add 3'rd line. I assume line 2 is template as minor is not required to do test/interview. Not sure what's happening.
I received test date only for me, which is expected.