[gwittel]

You're being scammed or the person is incompetent.

If the code isn't going to be handed over, then at least need full access to the AWS footprint to see what exists or not. If its web based, another way would be to ask for the URL to access the demo.

If you gain full access, then I'd image/backup everything for analysis. I'd also see if there's a way to split access controls so that resources cannot be destroyed by Ava in the event you need to revoke access.

If its all under Ava's control, you're screwed.

I don't really see any way to proceed other than kill the contract for non-delivery. Cut off any AWS access if possible before notice is served.

If the contract did not specify delivery of source code, then might be in trouble that way as well.