I would say let her try it again if you are comfortable with that. She'll most likely not be all that interested.
Even if she does start again, that doesn't mean she'll continue until she's 5 either - kwim?
Also at her age you can put some limits on it if you want to - like maybe not in the middle of the night (if she sleeps through the night you certainly don't want to motivate her to start nightwaking) - or maybe only nursing before nap and/or bed times. Whatever feels most comfortable for you.
Even if she does start again, that doesn't mean she'll continue until she's 5 either - kwim?
Also at her age you can put some limits on it if you want to - like maybe not in the middle of the night (if she sleeps through the night you certainly don't want to motivate her to start nightwaking) - or maybe only nursing before nap and/or bed times. Whatever feels most comfortable for you.