Your serve looks fine for 3.5-4.0 play. A more bent elbow at the trophy would give you consistency, something like a catcher's throw. Take more time before you serve, but I know you're just clowning around here.
Your forehand also.
Your volleys might need some help, in the one you showed.
Nice of you to hit easy right back to her. You could have just hit away from her and gotten no rallies.
Try to have the camera set 6' high directly behind you, to see path of ball and both players.