Hi there @mollymoo19,
thanks for reaching out !
Just to have things clear, Spotify accounts cannot be canceled or deleted, however Spotify subscriptions are the ones users cancel if needed.
In this case, if she was using a Free subscription and have not received any unexpected charges, i wouldn't try and gain access again.
Gaining access to the email associated with the old account is the best and fast way to perform changes within the account.
Hope this shed some light.
Let me know if you have any further questions 🙂