If you did a good few dates then you should be able to enter house. Although, once you have a high relationship with her, at her house she will talk about prom. She will get angry with you and then you will be locked out from her house permanently for now.
At the school, she is there next to Sandra. If not, then she would be next to the toilet entrance (first door from the left). After three tries, you would be able to enter the toilet. Other than that she is always next to Sandra
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is vastly superior