I'll say that Andrea's character development over the entire series is starting to make sense. Not saying that everything she's done is completely logical, but come on, she's a woman. All women are somewhat crazy.
I partially agree with the first sentence but as for the second, well it's not even worth a rebuttal, but I suspect the poster has thrown away any credit he has with a number of posters on this board
IMO opinion, Andrea's development this season has always made sense, it just has not been executed all that well. It's horrifying to me that people actually wish her or any other character to come to physical harm, to be raped and/or tortured; I wouldn't wish that on any character.
The following is just my opinion of course:
After half a year of living on the road, so sick she can barely walk and probably near death, Andrea (with Michonne) is taken in by thriving settlement that appears to be safe and well supplied, with happy denizens. Her illness is treated, she’s fed and housed in pleasant surroundings. She’s told that they aren't prisoners, that they can have their weapons back when they leave and that they are free to go. Michonne, who apparently can live with someone for months without communicating anything significant, tells Andrea that she has a bad feeling about Woodbury but refuses to tell her why. Eventually Andrea agrees to leave with her anyway and the gate is opened. Believing than that Michonne was wrong, Andrea decides not to leave this good place.
In the meantime, Andrea has met what appears to be a handsome, charming and intelligent man who is interested in her. She pursues the relationship and she starts to care about the people of Woodbury. The one run-in she has with him occurs when she ignores orders and jumps off the wall, and that is perhaps her own fault.
The next time Andrea sees Michonne is in a wreckage of glass, liquid, zombie heads and a dead zombie child, her lover stabbed in the eye and Michonne possibly about to kill him. How could she know what was happening? She holds her gun on Michonne but allows her to escape.
There are some weird things going on but Philip has plausible explanations and I doubt Andrea recognized the pilot’s head. Even the fighting in the arena attracts Andrea as much as it repels her. She understands the lure in a way that none of us truly can, though I could see why people might enjoy watching the slaying of the monsters that assail the remnants of humanity.
When unidentified intruders attack Woodbury, of course Andrea wants to help defend her home. It’s only when she sees Daryl in the arena that the little cracks in the façade of Woodbury really start to open up.
Her visit to the prison enables Andrea, for the first time, to understand what the Governor is. Even then she’s not told everything. Despite her feelings for Philip. she believes her friends. As Carol advised, she goes back to TG with the intention of killing him, but it’s not so easy for a normal person to murder anyone in cold blood and he had been her lover.
But Andrea still has hope that a negotiated settlement, a peace treaty, can be achieved and more bloodshed can be averted. By the end of the last episode she knows that peace isn't going to happen. Despite the danger to herself and her own inclinations, Andrea goes back to Woodbury with a yet unknown-to-us agenda.
Andrea has been naive, perhaps blind, and she's made mistakes but none of it was out of malice, greed or callousness. She's just human. Maybe we'll find that she's a hero.