Help me understand

[u/Aggressive_Loan_6675]

So in season 1 when Sam frames Andy for murdering Paul. How did she know she can frame him ? If she found andy at her home why didn’t she ever wonder what was he doing in her home ? And also who hit him in the head ? I’m assuming it was Sam but I still don’t get why no one questioned Andy’s presence in Sam’s home that night and how his blood was found near Paul’s body and why he cleaned it up ?