Should I ask or not? Am i over thinking the problem?

So one of my friend, I'll call her Rose for now, is leaving the country soon and decided to invite some close friends to a small gathering before she leaves. And as one of her close friend, I'm close with her other close friends as well. And just then Rose told me that one girl( I'll call her Amanda for now) won't be able to go because she's too busy. I kind of want to ask Amanda why can't she go just so that Amanda knows that I care (we haven't hang out for a while), but i'm worried that maybe Rose didn't actually ask Amanda, and if i end up asking Amanda why can't she make it to the gathering, causing Amanda to know that she's not invited, it would be horrible. But if i end up going without asking amanda, Amanda might think that we didn't invite her, and as a good friend of hers, i didn't even tell her about it..

Does anyone understand my concern?