Jiro, I don't think Tammy will play Scottsdale. It's the week straight after Dubai and it's a long way to travel from there. She didn't play there last year due to this reason.
BTW, the tournament in which Tammy had to withdraw from last year was "Stanford" not "Scottsdale" due to her food poisoning.
Fed Cup in China is the same week as Indian Wells. Do you think Tammy will play Fed Cup this year?