What information does Lady Clarke give the inspectors in Chapter Twenty of the novel, The A.B.C. Murders?

Lady Clarke talks mostly about Thora and about how she liked her at the beginning, but did not like her at the end. Lady Clarke says that she has sympathy for a murderer who has a messed up mind and that Thora lied to them. She saw Thora talking with a strange gentleman early in the day of Carmichael’s murder.