your only choices for 2019 are married filing joint or married filing separate. if her accountant doesn't know she's married, he/she will totally screw up the return he prepares for her. maybe her parents will claim her as a dependent - they can't or maybe he'll file her return as single - wrong. she's an adult, she can tell her accountant she's married. it would be a violation of the tax laws for him/her to convey that info to the parents or even let the parents see her return without her consent. if he/she does, you spouse can file a complaint with the iRS that will get him/her in much legal trouble. however, unless her parents are total dummies, they going to realize something is amiss. Fess up now.
