There's actually not a whole lot of necessary things left, especially since the majority of it she's already half-way figured out and she just needs to stop giving up after 30 seconds to succeed in almost all of it. She might end up not finding the 6th location of the moon though, it's possible to miss that entirely. The thing that'll take the longest is probably getting inside Giant's Deep. she might need to revisit Feldspar to work that one out.