A few corrections

Can I say,

(a)Last Sunday, after Susan had done her shopping, she decided to go home. She accidentally left her car key in her car when she went shopping.

(b) There was a man who offered to help her.

(c) She went shopping on her own.When she wanted to go home, she forgot to take her car key and left it in the car. She felt careless.

(d) After a few minutes time, a mechanic came to help her open the car door. It took for an hour to open it. At last, she was glad to have her car door opened.