Legacy, crazy grandmother, advice please!!!

[BidMe]

Hi everyone! I am so excited to be going to college and to be going through recruitment. First off my grandmother isn't crazy, she is just in love with her sorority (tri-delt) and the idea of one of her granddaughters in it. I come from a lineage of tri-delts my mom, grandma, and great-grandma. My older sister went through rush a couple of years ago at SEC school and did not go tri-delt and my grandmother was furious (and still is). My sister told me that my grandmother was calling her constantly during recruitment and she was even calling the chapter. And after she accepted the bid from the other house, my grandma wouldn't even talk to her about anything related to college/ sororities/ large groups of women/ etc.

Now it is my turn. I am going to a different school that I think is less competitive, but still pretty competitive. Tri-delt is a very good chapter there, and I am sure that many girls will be fighting for a bid. However, I don't want the pressure of my grandmother calling me every second and potentially calling the chapter to affect my outcome/decision. So I guess I have a few general questions that I need a third party to answer.

1. My mom stated that tri-delt does not consider grandaughters legacies, so will they consider me as "special" legacy for having 3 generations above me or will they just consider my mom?
2. My mom also said that when my sister was going through recruitment that they called her before rush to tell her about tri-delt on their campus (since shes a member from another school), do you think if I put my grandmother down they will call her? Technically I'm not a legacy through her.
3. If my grandmother does happen to call them, will they hold it against me? (Even if I try to explain anything to her, she doesn't understand how it works now).
4. Do you think I should tell me grandmother that my rush is deferred? My sister's rush was in January. So I think it would be pretty believable and maybe by the time I am done with recruitment she will find out where I got a bid.

Thanks for the advice! I am just so nervous about everything. And after hearing what happened to my sister, I am scared out of my mind.