Is there such a word or concise paraphrase that corresponds? Optimize might have the same root but it obviously doesn't have the same meaning. Is there any verbal form that could fit or does optimism (and any other philosophy) imply a self state?
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Similarly, there is embolden, galvanize, kindle and so on.
As far as "conferring" one possibility includes sublimate ((archaic) to raise to a place of honor). You might also indoctrinate someone in a school of thought or impart your worldviews.
If you want a phrase, perhaps simply "she turned optimistic" would suffice.
Most obvious is whitewash, “to cover over errors or bad actions”. Verb calcimine is a near-synonym for that, well-known but not commonly used. Less seriously, consider gloss over, rosetint and pangloss.
I'm still wondering what the something is that you're trying to make optimistic, but it seems that the common paraphrases are to inspire optimism or bring hope (to) or make optimal, depending on what you mean by 'something'.