"She sends this."
Translation:היא שולחת את זה.
This is הזה when it's describing something:
This book - הספר הזה
When it's on its own it's simply זה.
In colloquial Hebrew you can hear things like תני לי את הזה, give me that one. It's kind of an abbreviation of whatever the thing is: תני לי את (הספר) הזה.
But don't worry about that for now, just focus on the first part.