Some variations in word arrangement are a matter of style and don't necessarily affect emphasis. Although textbooks may present some ideal arrangement of words and suggest that any deviation causes the words that are out of their 'proper' place to beome emphatic, the reality is much more nuanced.
For example, although lata is separated from silva, the arrangment adjective–preposition–noun is quite common when the object of a preposition is modified by an adjective. Therefore, the adjective may not gain any particular emphasis from the arrangement.
Additionally, although lunae clarae seems to be in an unusual position, because textbooks often teach that genitives belong after the noun that they depend on, some authors (e.g., Caesar) routinely put genitives in front. So again, the phrase doesn't necessarily gain any special emphasis.
Finally, because, in general, adjectives can go either before or after the noun, the use of one position instead of the other doesn't necessarily lend emphasis.
You need to ask yourself what, if anything, would be gained from emphasizing lata or lunae clarae or pulchra. In your sentences, the answer is 'Not much.' However, context is important too. For example, if the surrounding text made it clear that there were both a wide forest and a narrow forest, the position of lata could, in that context, give the word more emphasis, especially perhaps if the author doesn't typically use the adjective–preposition–noun arrangement. Likewise, especially if the author more usually puts genitives after the noun that they depend on, the position of lunae clarae could be a way of, e.g., drawing attention to Diana's role as moon goddess as opposed to goddess of the hunt (which is the role that we might expect here, given that she's being said to live in the forest).
As I see it, the emphatic words in your example are quis in the first sentence and Diana in the second. It's no coincidence that each is the first word in its sentence. In general, the first place(s) that I look for emphasis in a Latin sentence are the first word and – especially if it's something other than a finite verb – the last. Based on meaning, emphasis on these 2 words makes sense in your example. After all, as the interrogative word in a question, quis really is the crux of its sentence; and, as the word that directly answers the question, Diana is the crux of its sentence too.