Are they culpable for timing chain going out after engine gasket replacement?

My daughter took her vehicle listed above to the shop for her suspension and a few other little things. They told her that her engine's oil gasket desperately needed to be replaced. She said okay, $2600.00 later she picked her car up and had to immediately turn around to go back because the oil light and engine lights came on. They told her it was fine. She had sludge on her engine. Get another (they had just done one) oil change in a month or two to flush it out. She left here the next day to go back to college but got stranded on the highway engine dead. They are saying they are not culpable, and it was the timing chain. I think that it is very coincidental that she had no engine lights until she went to the shop, and then her engine failed the next day.