Although there's truth to Peggotty's words, her views on how Clara should behave as a young widow are also somewhat restrictive: it's unclear whether she would approve of Clara remarrying at all, but she certainly doesn't want her to marry a man her late husband wouldn't have approved of. In effect, then, Peggotty believes Clara should devote the rest of her life to her husband's memory and her role as a mother. This is a period-appropriate view, but it also denies Clara any opportunity to act on her own desires. Of course, the fact that Clara's attempt to do so ends disastrously could be read as a statement on the dangers of "selfish" female desire.