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Although Evelyn could refill her spirit power using spirit stones, the process required her to concentrate, which would leave her vulnerable in the middle of the forest for much longer than she would like.
Regardless of the spirit stone's grade — whether it was a core or a crystal — it took around ten minutes for people to completely absorb its energy. This of course meant that the higher grade stones were much better, as not only was their capacity higher, they would also be able to provide much faster restoration speeds.
However, if her level-up process could already be considered dangerous when it only took a fraction of the time it would take to restore her spirit power using spirit stones, there was no need to even think about it in the middle of the Wonderland of Doom.