Basically, my mom's blog was getting good google traffic, about 50-100 organic visits per day from google alone. I moved to a new server, and within 24 hours she no longer ranks anywhere in her old keywords. She now gets about 10 visits per day instead of her old 70-80 per day. Literally nothing was changed but the server. My other sites on the same server kept their positions fine, but my mom's site got nuked. Her blog is osteodiet.com Any ideas?
How long has it been? It might fix itself in a weeks time. Sometimes your rankings can jump around temporarily when making changes like that
If it's only been 24 hours then the old server (IP) might be getting the traffic because the IP was probably cached in routers all over the internet. Give it another day and see if it comes back. If the URLs didn't change then there shouldn't be an effect on her site.
Make up your mind on the traffic details. Switiching servers can cause a drop in SERPS, it will pick up in a few days.
I would be worried if it stays down but not immediately. It may seem like nothing to you, but it can be best compared to a house move. It takes a while for things to catch up to you. Think USPS here!