The daughter just took mommy's hat.
I'm still not done setting the scene. Besides, I really like drawing Artoria's smile.
In Lancer Artoria's Love 2, Master mentioned that he daydreamed about the two of them watching their children playing. Artoria responded by asking him to love her a whole lot even after having children. In this timeline, this becomes true.
The top panel is also a little preview of Milftoria's size.