<p>Wait, so is the question “can I SIR to Davis although I already SIR’ed to Irvine and wait a week or two to decide which school I want to go to?” If yes, then the answer is no! You can’t SIR to two schools. So your friend pretty much has until the deadline that Davis gave her to decide which school she wants to go to. If she decides to go to Davis, she must cancel her SIR to Irvine before accepting the SIR to Davis.</p>