Neighbor

I wrote this when I had a bad experience with a neighbor my age

One day she's nice.
The next day she's mean.
Her sister reviled,
The names she's called me.
I can't decide,
If she's my friend or my foe.
Her level of maturity,
Is really quite low.
If only, if only,
She'd possibly see.
How her attitude
Affected me.
Then if possible,
She would be nice,
Rather than staring,
With eyes cold as ice.

Author's Note

Any advice on where to put some spaces?