You could try submitting your tax return with her SSN now - if her SSN is in the database you may even be able to e-file. If you cannot e-file you can still mail the return in with the SSN to your usual processing location.
When the ITIN office is open, you can ask them to withdraw the application.
A second identical tax return will likely be ignored by the IRS so it won't have any adverse affect for you other than the extra work for you to prepare the second return.
Filing with the SSN could have some benefits for you this year however, particularly in regard to the Economic Impact Payments that are being processed if your income is within the range that is eligible, as tax returns with ITINs disqualify the taxpayer from receiving any payment at all.
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