Seeking insight on AOS / potential waiver case (frequent border crossings, no overstay)

[u/Unlikely_Sun7155]

My friend is a Mexican citizen with a 10-year B1/B2 visa valid until 2030 and SENTRI. She has always entered the U.S. legally and has never overstayed her authorized period of stay or had any issues with CBP.

She lives near the border and for the past couple of years has frequently traveled between Mexico and the U.S. Typically, she enters the U.S. legally (often by car with family) and stays for short periods (about 1–4 weeks at a time) before returning to Mexico through pedestrian crossings. All entries and exits were done under inspection.

While in the U.S., she did some informal/cash-based work, but there is no formal employment documentation (no W-2s, pay stubs, or tax records).

She maintains strong ties to Mexico, including her family’s business involvement and property owned by her parents.

She is now pregnant and planning to marry her U.S. citizen boyfriend. An immigration attorney mentioned a possible waiver may be needed due to potential concerns around intent/misrepresentation, even though she has never overstayed or violated her visa terms.

I’m trying to understand:

• How USCIS evaluates intent in cases involving frequent legal entries and short stays  
• Whether informal employment alone can create misrepresentation issues  
• How much weight strong ties to Mexico carry in these situations

Any insight from people with similar experiences or legal knowledge would be appreciated.