**Yes, this could cause a problem, but denial of entry is not automatic.** A B-2 visa can be used for a temporary visit to a boyfriend or girlfriend. CBP still decides whether to admit her, including whether her visit is temporary. [State Department visitor guidance](https://travel.state.gov/content/travel/en/us-visas/tourism-visit/visitor.html)

The key issue is **whether her answer was true when she gave it**:

- **If you started dating after the interview:** She can truthfully explain when the relationship began. The change itself does not establish that her earlier answer was false.
- **If you were already dating and she knowingly denied it:** That could raise a question of *willful material misrepresentation*. A false statement is material if it affects eligibility or cuts off a relevant inquiry that could have led to a finding of ineligibility. In your situation, concealing the relationship could potentially have prevented questions about her intention to return home. That requires an assessment of the actual facts. [State Department misrepresentation rules](https://fam.state.gov/FAM/09FAM/09FAM030209.html)

Permission to visit a partner does **not** automatically make a false answer about that relationship harmless. A finding of willful material misrepresentation under INA §212(a)(6)(C)(i) can create permanent inadmissibility, though waivers are available in some circumstances. [State Department visa-denial guidance](https://travel.state.gov/content/travel/en/us-visas/visa-information-resources/visa-denials.html)

She should answer border questions truthfully. **If her interview answer was knowingly false, she should consult a U.S. immigration lawyer before traveling**, with the exact question, her exact answer, and the relationship timeline. Evidence of a temporary trip and reasons to return to Hong Kong may help establish visitor eligibility, but does not resolve a previous material misrepresentation.

Were you already dating at the time of the interview, and what exactly did the interviewer ask?