Yeah those pics look like building. The eating thing is correct. They should stop eating when actually gravid. You probably don't have to worry just yet. It's always good to be prepared just in case though. If she were gravid though, her spine would be "peaked" while her lower sides stuck out. Plus she would be that thick all the way down. Not just in the middle like that. Not unless there were only a couple eggs or slugs.
Probably building and not actually ovulated yet.