D.R. Horton Executive Assistant interview questions

The interview process was standard, although they contacted me via phone and I had no email addresses of anyone in the organization. It started with an initial screening for the job asking about my experience (fresh out of college and a few internships). Then I had a Skype interview since I was an out-of-state applicant. That lasted for an hour and it was mostly chatting about what my job would entail. My interviewer then decided that she wanted me to meet the regional director who I would be assisting. This process was weird because they were concerned that they couldn't Skype with me due to their network security and initially wanted me to go to their regional office to do it. Eventually, they set up a wifi hot spot without the network security to Skype me. The interview went well and I really liked the regional director. I had my interview on a Thursday and the following Monday sent a thank you. On Wednesday I sent another email (had found the correct email of my interviewer) asking the timeline they had for when they would make a decision. Both emails went unanswered. I thought it was odd given that they had been very good at communicating thus far. I began to wonder if someone was sick or something had happened at the office. I called my interviewer to verify that she was okay and left a voicemail. Today, I got an email from her saying that they had offered the job to another candidate last week and she cautioned me not to be so aggressive. While I thanked her for her advice I was left wondering why she wouldn't return emails or phone calls. I didn't think that the company had already made a decision, I just wanted to know the timeline so I could make decisions regarding other offers and job applications I had pending.