Hot answers tagged particle-de
Among a series of definitions of particle で, which you will find in your dictionary, this is a で denoting reasons / causalities. Your example, though the wording seems to be kind of culture-specific and I find it hard to traslate, may roughly mean something like "It' funny she is acting like a senior only for these reasons" (these reasons depending on the ...
You can regard it as either 連用形 of copula or a conjunction particle, either way, it indicates the clause （…必要があるとのこと）is not the final predicate of the sentence. To distinguish it from case particle で, testing if であって can work will help. これは非公開の話ということで おねがいします： case particle で これは非公開の話ということで（あって） 他人に話すべきではない: conjunction particle で
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