1. (为隐瞒或逃避某事而)暂不作决定，迟迟不作答复，态度骑墙
If you say that someone stonewalls, you disapprove of them because they delay giving a clear answer or making a clear decision, often because there is something that they want to hide or avoid doing.

1. engage in delaying tactics or refuse to cooperate

e.g. The President stonewalled when he realized the plot was being uncovered by a journalist

2. obstruct or hinder any discussion

e.g. Nixon stonewalled the Watergate investigation
When she doesn't like to face a problem, she simply stonewalls