I certainly don't like busy bodies too but won't get them killed. Considering how her mother was behaving, she might have been a fool to be going so far the douche hero and I should say it was partly her fault too (getting killed). Didn't she have a sense of her own security and care for her daughter and especially since they both died in their world so, now they should be more close and be more worried for their own security. Well, I'm saying this based on what was told just now. and yeah, Don't debate with me whether killing her was right or wrong, but taking into a/c his personality, it was a likely outcome.
I'm not supporting the douche hero, but don't blame him entirely.