You could skype or talk to your mom's friend on the phone if that makes you feel better, but in this circumstance it is not necessary.
The next thing you need to do is ask your mom's friend if she knows women in other sororities who might be willing to write a rec for you. And you be sure to write a sweet thank you to her and let her know where you pledge.
__________________ I live in Fantasyland and I have waterfront property.
Teachers, Coaches, supervisors at work, people at church, parents of friends, friends of friends, all of these are possibilities. Many people are Greek, and you probably have more Greek contacts than you know. Ask men as well as women, for possible contacts and leads, since fraternity men know sorority women. Don't be shy. The best way is to let everyone know you are planning to rush and you are looking for recs. Good Luck!!