Here are the reported speech conversions for each sentence:

1. I said to her, “I’m going to get married to you.”
**Reported speech:** I told her that I was going to get married to her.

2. Charlie said, “Tom had an accident last week but he wasn’t injured.”
**Reported speech:** Charlie said that Tom had had an accident the previous week but he hadn’t been injured.

3. She says, “Many young singers in our country sing badly.”
**Reported speech:** She says that many young singers in our country sing badly.

(Note: Since the sentence is in the present tense, it remains unchanged in this case.)