No, this does not mean she will need it this year and this does not specifically mean if you decide to amend in the future. You can file this year Married Filing Separately without the SSN or ITIN. Also according to this IRS source, you have three years form the due date of this year to amend the return to Married Filing jointly.
According to this Turbo Tax source, you may file this year married Filing Jointly by attaching a W7 to the return and supply all supporting documentation.
As I stated in my previous post, 21.6.1.4.1 (02-04-2022) refers to the fact that you have up to three years to file a Married Filing Jointly Return after making the first year's election to file separately. When you decide to file Married filing Jointly, you must have a valid ITIN or SSN to file this type of return. This includes filing an amendment.
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