Using TIN or SSN Question

I have a question about using Tax ID vs. SNN on tax return: My wife didn't have a SSN, her visa status allowed her to have Tax ID (TIN) only, which we used for the last few years on our joint tax return. This year she received a permanent resident's status and now has a SSN. My question is: Can she still use her TIN for the 2004 tax return? The reason I'm asking, she has a IRA account which is registered with her TIN and I'm afraid that if she uses SSN on tax return this year, IRS won't be able to match her IRA account contribution to our tax return, but on the other hand, I'm not sure if it is allowed or legal too continue using Tax ID (TIN) after receiving the SSN. I realize that it was the best to re-register her IRA account under her new SSN so that the report which the bank sends to IRS will be under her SSN, but now it is probably too late to do it for tax-year 2004. Regards, IP.