What is my employer's legal obligation to my missing paycheck?

i originally was supposed to receive my paycheck for may 1st-15th in the mail, but have not received it. i have asked my employer about it quite a few times but get a different answer every time. she claimed to not have mailed it until june 10th. i've asked her to put a stop on the original check that i have not received, but what she is telling me is that they do not have the check number so they can not put a stop on it. now she's saying all she can do is give me a loan until the original check returns to her, which doesnt sound right to me. im wondering, by law, what is her obligation to my check that i have yet to receive?