The entire arc of Laurel's story was constructed to show that Randall's mother was beautiful, intelligent, creative, kind, spirited and fiercely independent -- and continuously had the deck stacked against her, always preventing her from being with those she loved; her aunt, her brother, Hai, William and Randall. She did get another bite at the apple with her aunt and Hai, although how the reunion with Hai came about doesn't hold up well if you really look closely and think about the fact that first of all she left him crushed when she ran off knowing that he could not abandon his parents when she could have chosen to stay with him then. Secondly, it was a small community, particularly surrounding the farmer's market. The writers attempted to portray it as if somehow Laurel both returned to her aunt and yet never crossed paths with Hai for years until his wife is terminally ill? She loved William deeply, believes they suffered such an unbearable loss and never attempted to find him again in all those years? She made some deliberate choices not to fight to be with people she loved for reasons of her own that boiled down to her own reasons not to fight the odds.
As far as jailtime holding her responsible, nope. It was all written very deliberately heavy handedly to give Randall the story of how he was ripped from the arms of his mother who loved him. The whole O'Henry-esque maneuver to keep Laurel, William and Randall apart and unknowing while tugging on our heartstrings was just too much IMO.
The start of the story with young Laurel was great. You immediately fell in love with this wonderful girl and wanted to know more. The heavy handed writing trying to turn itself inside out to achieve an end result was too much. And I believe on some level writers, producers, whomever it was, understood Randall encountering his mother in the lake required an actress who was definitely older and absolutely couldn't work if the actress was near his age. That scene was creepy enough already. The actress playing older Laurel was fine, probably underappreciated because she was stuck with trying to hold up a story that didn't have any working elements by the time she stepped in.