"They're still living with it and trying to come to terms with it now."
Jessica has had counselling since the incident, according to Peter, who also revealed she remains in touch with survivors and victims' families.
Speaking to the Sunday Mirror newspaper's Watts the Goss column, he explained: "She's very active in making sure she looks after herself.
"And she's been very active in making sure she's been helping other survivors, it has to be said.
"She's also involved in a lot of the victims' collectives and things like that so it's good.
"She's done well to sort of pull it round and help rather than suffer, do you know what I mean? So yeah, I'm very, very proud of her."