My mothers death (edit 1 )

[Brownlie]

I'm going to try to cut some of your lines and fix a few things here. You might still like it the way you had it before.

waves roared upon the shoreline
Wind faintly whistled
gulls flew above in flocks
a casting sun shadowed
clouds
Strewn seashells and bodies lay

She was young with sporadic freckling
her skin still smooth and sultry
"what are we going to do?" Margie said
as she moved her hand into the wind,
her fingers reveling in the feeling of
the air.

I contemplated what she had asked
As we walked while leaving footprints
in the sand.

I pulled my hands up and looked at them
There was blood underneath.my fingernails.
We passed a sandcastle that she put her foot into. -- Some solid imagery here

The sand crumbled around and part
of it collapsed. It was warm yet chilly
and there was a great view of the coast. --- More good stuff in this stanza

She didn't know why we came there except
that we had to go somewhere.

She had just stabbed her mother, and yet
she gingerly moved throughout the beach
Seeming not to care.

It wasn't her fault that mother began to punch
her in the face over chores that were not
finished. -- Wow man

I remember the details and the screams they both
made during the scuffle. The hasty grabbing of
the knife and the first wound inflicted.

It was beautiful and tragic. The bookcase
was tipped over and the room destroyed by the
time they were through.

In the end, mother was stabbed ten times and
bled to death pleading for help.
I stood there in the frame of the doorway and
watched it all. I didn't lift a hand to stop it.
I watched Margie kill her.

The body was heavy, I used bleach on the floors, and thought, "it
must all come out, the blood must be removed." - not sure if you quote thoughts but I think you do.

she felt lifeless even in the last few breathes she
would take as I moved her in the hall to a sheet
that I would wrap her in for the last time.

Margie was calm for a murderer. .
We disposed of the body in the Atlantic Bay.
Throwing my mother over a bridge was
the last thing bad I wanted to ever do again.
I believe Margie might have felt the same way
except she laughed when mother splashed into
the sea.

I look at Margie and all I can feel are
the waves that roar upon the shoreline

Your syntax is awkward at times but you've got a story here. I tried to clean up some of your syntax and cut some superfluous language but I didn't want to do too much and take away what you were trying to convey. Good luck.