Modification?

I think it's ok Carol. For instance unofficial results might have preceded it on Sunday

I can't make "for the legislative election" work as a modifier. It doesn't modify anything.

It's fine where it is. It could also directly follow "Official results". Youi know you can usually say the same thing many different ways, and they'll all be okay.

I think there might be some confusion as to what a modifier is, Rog.

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MacMillan Dictionary

modifier

a word or phrase that adds to the meaning of another word or phrase by giving more information about it

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M-W online

: a word or phrase that makes specific the meaning of another word or phrase

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When we front the phrase in question, does it appear more modifier like?

The legislative election official results were being released Monday ...

"Official results / were being released

(when) = Monday - adverb
(what kind of results) for the legislative election - adjective

"which followed a week of demonstrations and hunger . . . " explains more about the events following the election.