I forgot to add the following sentences. I really hope you can have a look at them.

She assured/informed me that the money had been paid.
1) She promised me that the money would be paid.
She confirmed/explained/thought/reported/added that the money had been paid.
2) She complained that no one had taken her to the airport.
She complained about not being considered.
3) She confessed (to?) stealing the money.
4) Your paragraph doesn't make sense at all. You must use the simple past when referring to actions happened in the past.

3. Yes, keep "to" in there.

Everything else is fine.