The Modern Family star, 14, has been removed from her home and placed in the temporary custody of her 34-year-old sister Shanelle.
But Bowen tells In Touch magazine she had no idea the teenager was so troubled.
She says, ""Never have I seen (what's being reported). That was never my experience (with Ariel and her mum). I watch the news and that's all new to me.""
Bowen and Winter have been close for the past three years as co-stars on Modern Family.
Winter's real mum, Crystal Workman, insists her daughter is only retaliating against her attempts to break up the young star and her 18-year-old boyfriend.