Poor Lollys. Her arc reallly does seem to be the actualisation of all the things that threatened Sansa - being raped and ending up pregant by the mob and (seemingly) forever trapped in a loveless marriage with a man who's had a hand in destroying your family. When Tywin presented Tyrion with the offer of marriage to Sansa, Lollys was positioned as the worst possible alternative, whilst Sansa took the place as the "best." But I do think that Martin has tried to show that both girls aren't so different, at least not with regard to the fates they each suffered. Lollys naturally struggles to articulate her suffering and oppression, but Sansa's marriage to Tyrion also rendered her virtually speechless, and she descended into a dark depression during this time.The disregard of women's personal happiness, and their essential vulnerability in a patriarchal, feudal society is made even more apparent by Lollys' situation because of her mental unfitness. She has no refuge she can seek, and we can only begin to fathom how traumatised and terrified she must be.
I would dispute the claim that Lollys has a decent life now. She had a decent life when she had her mother and sister around to protect her. Now she's left at the mercy of Bronn, who seems to have no compunction in taking advantage of his wife and using her as a tool to advance his position in society.