She builds Runic > Liandries basically every game. Then its AP/defensive items usually. Most commonly Hourglass > Deadman's >Visage
I'm loving everything about this champion the only thing I dislike so far is the items you are suggesting after Hourglass. Building Tank with no Deathcap or Void Staff doesn't sound fun at all. Is it because her AP ratios are low?
Its mostly because her defenses don't scale well with the rest of the damage in the game. She hits a really strong mid game spike and needs to carry that through to close out the game, so mostly in late game fights liandries + passive + dark harvest do enough damage that you really just want to stay alive longer.