Hope you don't get offended with what I am about to say....
It just looks to me that you're on your friend's backup list....
may be she has some guests who can't make it at last minute and she
just wants to make sure she can have enough people at the wedding
reception to pay off her wedding expenses.
I might be wrong....
she got told us (in march during our other gf's wedding) she
getting married but w/o actual date lah... tat was when her bf
proposed to her... knowing her, it prob slipped her mind + take for
granted the few of us will definitely be thr...
she is in a hurry to get marry + have kids lah... cos she feel
her bio clock ticking... kns then i wat?! >.<