Rita - The monster Frank produced:

doesn't speak naturally (p.51; p. 67)
doesn't depend on him any more (p.54-55; p.68-69)
has changed her name again (p.69)
prefers young, classy people (Trish, Tiger) to Frank.
Instead of being subjective, innocent and unique she is now standardised in her judgement (p.67)
Rita has gone - Susan is there