She's a girl on the beach catching a Frisbee and tossing it and having fun.
It's a fun game.
Her name is Mary.
She's playing a game with a disc.
Playing a game with another girl at the other end.
She would have gotten hit in the head.
I assume she's okay because she's got a smile on her face.
She's having a lot of fun, too.
That's having fun on the beach. No other explanation needed.
She's got sandals on, and she's got a Frisbee in her hand.
The dog is going to catch the Frisbee and bring it back to her.
I think the family that owns the ball is playing in the game.
According to these pictures, they're having fun.
I can see she's a fairly elderly woman, judging by her figure. The legs are not straight.
Having a ball at the beach.