You can get married after she files ... you don't have to wait until the discharge.
Practically speaking, however, I would wait until after the 341(a) Meeting of Creditors (approx 30 days after filing) because she will be required to disclose her change in circumstances to the Trustee.
Should not be a problem. If you are now living together, there may be some means test issues, regardless of your marital status on the date of filing.
I agree with Mr. Whitaker. BUT, it you are living together YOUR income will be considered in whether or not she passes the means test. Consult with BK attorney to have the numbers run. Good luck.
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Get married whenever you like it is the status as of the filing date that is important not the discharge date. Good luck in life and marriage.