thank you all for your support and advice! i think i just reacted badly initially. i'm really happy for her, but i just wish it wasn't so close to my own wedding. i'm going to be stretched for time with both events going on. she had other options available, but they purposely selected that date.
her FI is competitive by nature, so i'm afraid that's what's driving most of this. he always wants to out do everyone. my ring isn't flawless or colorless, and he made it a point to tell her how he only wanted a colorless and flawless ring (which she reiterated to me). and yes, our e-rings are both round solitares, when she used to want a princess cut solitare.
moemarsita, i too was initially upset that she had upstaged my engagement, especially since they hadn't set any firm dates or purchased the ring. so it was still up in the air UNTIL i got engaged. then all of sudden, they were engaged.
mrsbabysalute, i didn't take her with me dress shopping, so she doesn't know what my dress looks like. if she got the same dress and sash, i think i'd be even more hurt by her actions.
i guess to me, it's about having consideration for others. i would never have scheduled my wedding 2 weeks before her's. i would have pushed it either forwards or backwards. it's not like they're in a hurry either, so there's no reason for them to select that specific date. sigh.
to all you girlies, i'm really sorry for rambling and complaining about this. i really appreciate you listening and giving me advice...