Is she a scam or legit?

Got a call form Kimberly Roberts needing a sitter for her 67 year old mother. Seemed legit but now I'm kinda iffy about it. Can Any one give me details about what she's said to anyone?

The long and short of the story is that at some point, you will be perfect for the job and "hired".  They will then send you a really big check, tell you to take out your first week or so out of the check, and then send the rest somewhere to "pay" for something.  That money will be sent using Western Union or Moneygram.  The check will bounce, you will be out the money and the bank fees.