Gravity Falls AU 2 (potential spoilers or hints)

Unknown girl about parent

Unknown girl:
Happy to listen
Happy to play
Happily watching -her- him drift away

Happily waiting
All on my own
Under the endless sky
Counting the seconds
Standing alone
As thousands of years go by

Happily wondering
Night after night
Is this how it works?
Am I doing it right?
.....

You keep on turning pages for people who don't care
People who don't care about you
And still, it takes you ages to see that no ones there
See that no ones there
See that no ones there
Everyone's gone on without you

Finally something
Finally news
About how the story ends
She doesn't exist now
Survived by her -son- daughter