What happened to Kat Von D sister on la ink?

On "LA Ink," Kat Von D's sister, Karoline, appeared in a couple of episodes, primarily to support Kat and showcase their relationship. However, she faced personal struggles, including issues with substance abuse, which were touched upon in the show. This led to moments of vulnerability and concern from Kat and the crew, highlighting the challenges within their family dynamic. Ultimately, the series provided a glimpse into Kat's efforts to be there for her sister during difficult times.