"She is more responsible and thoughtful on what she does."
I'm not very good with English. Please help
Most Helpful Girl
"She is more responsible and thoughtful."
The last 4 words add no value.5
Most Helpful Guy
The correct way is: "She is more responsible and thoughtful IN what she does."
This is the proper use of the preposition "in". On is used as a location description, such as on the shoulder or can be used to describe an immediate action, the house is on fire. In is also used as a location descriptor such as in the house or can describe a belief, opinion, or interest. I am interested "in" science. In you case it is a descriptor for "in" what she does. The context being does.0