She knows there is more to life than digging, but still she digs. She knows how it looks, worthless and silly, but still she digs. She knows there is almost no chance of finding what she is looking for, still she digs.
Maybe if she was actually digging with a real shovel, maybe then it would make more sense, though probably not. Her's is a metaphorical digging, embarrassing yes, because in the world there's a lot of real digging to be done, and she is not doing that.
And even when she finds what she is looking for (though truth be told she has no idea what she is looking for), she is satisfied for only a very short time. She concludes it is not about the finding, but about the digging, a very dull conclusion since she's come to it many times before.
But still she digs.