Yes. She amends her return to file Joint, and adds you to it. Form 1040X must be mailed, and takes about 16 weeks to process.
https://ttlc.intuit.com/questions/4257165-amend-2017-tax-return
Did your husband file as Married Filing Jointly already? Let me know.
my wife filed as married filing separately and she got accepted . we now want to file jointly is it still possible for us to do that ?
thank you that was helpful