The moon is crescent and she looks through the window. She waits for someone, probably the one who's going to take her away from there. She doesn't know him; she just created him. So that he could meet her and make her, finally, happy. She's in that tower, somewhere there. Waiting.
While she waits, the other part of her mind lives the (unhappy?) real life, where he hasn't met her yet, either.
But she waits patiently for the one who'll be loved, who will love her and make her happy. There won't be stones, and if they exist anyway, they'll be meaningless. Everything will be meaningless after he finds her (or after she finds him?)
But while none of this happens, she waits, having faith that someday, everything that she built in that tower will come true.
The tower is high. Only someone really special is able to climb it. It prevents that she gets hurt when she goes down, or ends up being kidnapped by a rat. It has to be him. Or maybe him.