Move Created Website to Another Account

I designed a website for a client, it is 90% complete.  I invited the client to become an administrator on the site so she could set up the subscription plan and purchase the domain.  She did that, but not through the link I sent.  So now she has a domain and plan, but it's not through the website template I've been working on.  Do I need to start over or is there a way to move the complete work over to the domain and plan she created separately?  Thanks.  I'm trying to do this with the least disruption to the work I've already done.

Talk to Squarespace Support, you'll need to cancel the plan on the undesigned website, get a refund, and purchase a plan on the designed website. I've had this happen and it's never a problem with help from SQS Support.