Problem transferring WordPress to new location

I setup a blog for a friend at her domain https://www.sweetpeaphotos.com. The blog was setup at https://www.sweetpeaphotos.com/blog. After setting up the blog we decided to use a web service called Fluid Galleries which does professional photography sites. The issue with Fluid Galleries is that they do the hosting, so I had to use an IP Address (A Record) to transfer the domain to them. So now https://www.sweetpeaphotos.com refers to their servers and now 1and1.com, my web host.

Well, this obviously has screwed up the blog. Links are broken, pages aren’t loading, and I’m getting lots of “Error 500 – Internal server error” messages.

I’ve tried some different things to get it fixed, and was able to fix some of the broken links and reconnect some of the images, but I haven’t been able to fix everything. I’m really clueless at this point and not sure what to do. Any help would be much appreciated.

This is the blog:
https://blog.sweetpeaphotos.com/

Thanks so much for your help!