Fiances` Family Throwing A Shower

My Mother-in-Law to be has decided that she wants to throw me a shower in Ohio (I live in Michigan- they are originally from Ohio). I have not met any of my fiancés family except his mother (only for a few hours 1 1/2 years ago because his family is not local- his parents now live in the Bahamas)

She originally agreed to throw a "Couples Shower" for us so that I would be more comfortable, considering I haven`t met anyone. Without telling me or my fiancé she decided to change it to a Bridal Shower.

She will not invite any of my fiancés friends or their wives because she states that etiquette says that only family should be invited to bridal showers. We had to beg to have the wife of the best man (who lives in Ohio to be allowed to be invited to the shower.)

Though she is throwing the shower- she is showing that the shower is being thrown by my fiancés sister-in-law and one of his aunts. (per the etiquette books again)

The invitations just went out and though we provided it to her, the information was not included as to where we are registered. When we asked about this we were told that including this information is not proper etiquette and that if people want this information they will ask when they RSVP. She states that including this makes people think that they must bring a gift.

I am so confused... Is she looking at etiquette books that are old and outdated? Everything I read contradicts her "etiquette for throwing a bridal shower" completely. I have thrown and have been involved with several and have never heard any of these rules of etiquette before.

I am afraid that this shower is going to be completely horrible. My fiancé and I will end up with gifts that we can`t use and can`t return and I am going to have a horrible time because I will know no one at this event. I can`t wait for my real shower here in Michigan with MY family and MY friends!

Thanks for any Rules of Etiquette you can provide.