I know there is a word that means 'healing' as in "The therapy session was very ______", blank meaning it was healing (possibly of emotional wounds from the past).
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I often see "cathartic" in this context, which describes the release of negative emotions. I think this word implies a healing process.
I would suggest sanative or sanatory. These words mean 'healing' and could be used in your sentence to convey this meaning.
I think both of the suggested words have some problems.