Take a break. And revisit the lessons, IF that is what she wants.
It does not have to be piano.
I took piano as a kid.
I HATED it. We had a baby grand piano. I STILL HATED IT.
I would, RUNAWAY, at the time it was my lesson. I would hide outside in our yard. And stay there, until I knew it was too, late.
I hated piano. I rather do other things and other instruments.
Try getting an iPad, it has an app on it called "Garage Band" in which you can learn instruments, hear it, play it and even compose your own music on it. Even Pro's use it. My kids... play on it and compose music on it, by ear.
It can ALSO be used, by putting it on the piano, and then while sitting AT the piano at the same time, a child/adult can then learn (on their own thru experimentation) how to play. My friend's daughter does that, and she is gifted. And creative. And this mode of playing... suits her. It is tech, geared.
Don't be to serious about it.
Kids this age are very fickle.
They need to have fun, play, and learn that way.
Not many 5 year olds, will like formal lessons.
And even 1/2 hour, is a lot for them.