It's not bad at all Sheri, though it definitely needs another run through.
For example there are a couple of technical issues such as 'After a half hour passes, she falls asleep on the sofa.'
What precisely do you want to show there? Give visuals, something the director can work with, at worst.
CUT TO:
Rebecca dozes on the sofa.
CUT TO:
.....
or do it as a montage or something.
More importantly, you are selling yourself short on drama. The interaction with the maid; coming round in the past; dealing with the clothes seller - all of them are a bit too easy. You need to build up the tension. She'd be confused, scared, totally freaked out probably. Even if she thinks it is a dream, there would be more reaction. All of this could go in when you rewrite though so it's not a big deal, just giving my thoughts.
As it stands, I found my eyes 'skipping' as I read it, as there was no drama building. You've got the basis of a good script though so please do look over it on the dramatic side. Imagine you're watching it on the screen. Watch similar situations (the changed world theme is common) and remember the basic rule of screenwriting - steal for all you're worth!
Definitely keep on with it though.
Paul