Server Transfer Havoc/Not Able to Log in to Admins

What has happened:
I was attempting to transfer a test wordpress site from my server to my clients. AKA make it live. In doing so, I diligently followed the wordpress instructions to make this happen, uploaded the database to her site, changed the php file to find the database content, uploaded all wordpress files to her server, logged into my admin account for the test site and changed the url to point to her url. It seemed to work and then…

Now the problem is, the links are out of control. Sometimes they point to the right files within her URL, other times the point back to my test site. This is making some things show up and show things not show up. Here is an example:
This where the site should live completely now:
https://casholman.com/ (which looks fine in firefox)

When I click the “Interiors” menu button it goes here:
https://www.goodgrrrldesign.com/wordpress/?pcat=interiors#all (which is the test site address and is missing all the image links)

However if I click on one of the links on that Interiors landing page it goes back to casholman:
https://www.casholman.com/?portfolio=music-room (and looks fine in firefox)

She is saying in Chrome she is getting a lot of broken icon images and stuff too.

To make matters more confusing/worse I am not able to log in to either casholman or goodgrrrldesign wordpress admin. What happens is it just keeps knocking me back to the login page (not saying hey you used the wrong password! or anything, just like reloading the admin login). It seems to me that wordpress has gone haywire in confusion about where all this stuff lives now but I have no idea how to fix that… Any ideas you might have to troubleshoot this would be VERY MUCH APPRECIATED!!!! I am a bit of novice but follow directions very well so any help you can offer I would suggest spelling it pretty dummy proof.

Thank you!!!