I'm not really into MILFs or the entire mom/son thing, but damn if Anna doesn't make me break both of those rules. I'm really into brother/sister, but in my ranking of the female characters, she places just behind Lisa, and ahead of Alice. If her dialogue was better, or she wouldn't have taken Eric's side so completely or made other questionable choices since then, she could possibly even beat Lisa.
Thats my point. Her dialogue is sad for the first half of the game. It picks up a bit after Eric, but it is still rather stale. Even during the Eric parts, she could be uplifted a bit by having her quit saying the same things, and constantly going Eric this or Eric that. She needs more personality. She was being manipulated into certain actions by Eric, but nothing in the story says she was brain washed by him. If they just added a bit of doubt about him into her dialogue, that would make it so even if she sides with Eric, you get hope that it won't be forever..... Course it is forever until you get rid of him, but the player won't know that, and it would make the story a bit more bearable during that section.
Example.
Eric spying on Alice, Anna comes out after commotion with Max and Eric and when Eric tries to explain, she says, "But why did you come out here naked? What if Lisa or Alice had been out here? Oh well, I see it is Max and I can guess what went on here. Go to bed Max, we will discuss this during breakfast tomorrow."
This gives her more personality and makes it look like Max's fault for being such a perv that he is easily considered the person at fault. Basically he has caused so much trouble with his peeping that his mom has no problem believing that the commotion with him and Eric was Max's fault.