Tax return for I-485

[ferenji]

My wife doesn't have any income but her dad is the co sponsor. So we filed both the I-864 for my wife and the I-864A for her dad. Today the USCIS has asked us to include a tax return for my wife even though we filled $0.00 in the income amounts on the I-864.
Any help How we can deal with this issue?
Because of this reason my I-485 is not moving forward but i have given my biometrics two weeks ago. Is the tax return issue gonna affect getting my EAD?

[Amard]

Send in her tax returns even thuogh she made no money....
Your EAD application will not be affected