Changing Address while waiting for NOA2

[James and Cynthia 70]

My fiancée, the beneficiary, has recently moved from Taiwan back to the Philippines after I filed I-129F for her K-1 Visa. We have already received NOA1, but are still waiting for NOA2, with another two or three months to go. I have read what to do to change her address, but have a couple questions.

First, we have to call the NCSC and tell them the address. Can I do this for her?

Second, she needs to file AR-11 form. However, in the online form, it asks about her entering the US, and where her point of entry was. But she hasn't been here in the US yet, so how do I answer this? Also, what new address should I use for her? She is staying in Batangas with her parents while waiting for her visa, but she fears it is too hard to receive mail reliably there. She wants to use her sister's address in Alabang, where she frequently visits. Is it okay to use her sister's address even though she is not living there?

Is there a time limit that she must change her address by? I have read 10 days, but I think that is for someone in the US. What if that time has already passed? I think it has been 3 weeks now.

Thanks,

James