Contacting principal of an old school and being snubbed, i feel

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This is the school where i enjoyed working. I saw a job ad a month ago, sent an email with documents to an official email address and nothing, which made me really disappointed. They published a job ad yesterday and i remembered i had a number from a female principal and i sent her a whatsapp message, which i regretted not doing it the first time. I also sent 2 documents, my cv and where i worked before, as a proof i worked in her school before. She saw the message yesterday but didn't reply it. She replied it now, that i can express my interest via email and that's it. I feel it was said shortly and very formal, like she's meeting me for the first time. I feel she's not interested and why should i send another email, if i wasn't called the first time, after my first email in february. She is the one that calls people for work. For a job that is barely a month long, some people are all kinds. Also, i didn't like working in one school but they called me to work again so, i don't understand the deal this principal is doing. Isn't in their interest to hire people who worked at their school before. I've heard that is how things work for majority and this is a month long job again. Also, i perhaps acted in rush but i answered i expressed my interest even on February 24 and she can check the inbox. Short answer from me too. I am glad i saved my February mail. So, that's it for me. If you need workers, hire them. If not, stop playing with them and being rude. I'm too tired for sucking always up to people actually, employers.