What are the steps for my daughter to stay in Thailand for 6 months regarding visa requirements?

Hello! My daughter is travelling to thailand & wanted to stay 6 months. This is completely new to us but have researched the visa process & just wanted to ask on here. We gather that she'll have to apply for a 60 day multi entry visa beforehand, then go to an embassy to extend for 30 days. She needs passport photocopies, photos & current visa to do so. After this will she need to exit the country & apply for another 30 day visa on return & can do this twice. Is this correct? It's very confusing! Thank you

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