I don't think she ever changed her opinions for Ed (or anyone else) I think she always had a good read on people from a logical standpoint, but would usually let her heart make her final decisions when it came to people.
My opinion, based on things she said not just to Ed but to other people, is that Jade knows exactly who and what Tim is, in terms of manipulation and game play in the house. For her, though, the knowledge, in her head, of these things, did not stop her from still feeling an emotional connection to him. So while she could often discuss and agree with Ed's view on an analytical level, and maybe even offer a different perspective, she would never be able to let that view completely replace her feeling of fondness for Tim.
A really good example, actually, is with Drew and is actually separate from Ed. When Drew betrayed Jade to Tahan, Jade raised Drew's untrustworthiness to Mikkayla. They reconfirmed that in another conversation we saw. Yet when Drew sat and chatted with Jade a few days later, Jade reported to Mikkayla how great it was to have a chat with him, even if she wasn't sure she could trust him. Later, when Drew went after Jade during that family dinner, she was incredibly hurt, telling Mikkayla she was done. And yet she STILL couldn't bring herself to nominate him. Analytically she could feel betrayed by him, she could see his behavior for what it was, but her heart still insisted on seeing him as a friend, as someone she valued. It's that conflict that she felt, with both Tim and Drew, that was at play, not Ed. Ed certainly tried to reinforce the analytical side, encouraged her to let it dictate her actions, but we never saw that actually happen.
After Ed left, we saw Jade still expressing conflicting opinions. For instance, we heard Jade telling Boog how great it was to get to know her, that she had really helped Jade during this time. Yet as Tim grew frustrated with the other 3, he expressed many negative opinions of them to Jade, and, because she wanted to support him emotionally,Jade ended up separated from the others and talking about how she had nothing to say to them. But when she was discussing Tim's behavior with the others after the prank melt down, Jade really had an insightful opinion into Tim's behavior, which wasn't all positive, yet she still ended up hanging with him the most. Ed wasn't there for any of this, yet she was still exhibiting the same logical-emotional duality that she had had when he was there.
And jiminiy crickets, I need to write shorter posts so I can keep up with this thread!