Hearing Aaron's words and knowing what he has done for her, Katrina feels a strong sense of guilt.
"Aaron, Uncle Anderson gave me a key to the safe before he died, and he told me all the truth. Actually... I owe him nothing, nor do I owe him anything to the Anderson family."
On the contrary, the Andersons owe her more.
Carl has caused the death of her father.
Now, Aaron has given Winnie a check to pay off Carl's raising her over the years.
Aaron has also managed to stop Melvin from retaliating for the Anderson family.
She doesn't want to have any more entanglement with the Anderson family, nor will she tolerate humiliation.
Henceforth, she will no longer be entangled with the Anderson family, nor will she have any gratitude for them.
Now she owes more to Aaron, and she feels she can't pay him back.
All she wants to say is just a few words, "Aaron, thank you, and sorry. I apologize for the past."
Thanks, him, for doing so much for her.