Not necessarily true. Contrary to numerous posts on this thread, it isn't exactly difficult to get a visa when it's family based immigration.
Firstly, what rules has Trump changed exactly? Or just jumping on the bandwagon?
For Consular Processing there has been no change to the process at all.
The only minor thing to happen was Trump removing the requirement to have had a Covid jab within 12 months of the medical exam (winner, that saved £90).
She has potentially 2 realistic legal avenues and one not so legal avenue.
First option is if they get engaged, they go through the K1 (Fiance) visa. Takes around 6-9 months to process and as long as they can prove they have met at least once in person, then pending any criminal issues, it'll most likely be approved. She can move, get married within 90 days and then adjust status.
Second option is the spousal visa through consular processing. Probably about 18.5-19 months in total (14.5 for I-130 approval and another 4-4.5 for NVC/Medical/interview). Again, unless any significant criminal history then it'll get approved.
Third, not so legal option is travel on an Esta, overstay, get married and adjust status. Technically, although it is immigration fraud and illegal, an overstay is forgiven when married to a US citizen.
However, the wild card option is employment based. If she is a nurse, then it is possible. They are crying out for nurses here and to the point where job adverts are encouraging overseas applications and that they'll cover all immigration costs.
Chances are they'd do the H1B visa first to get the nurse in the job (2-8 months processing time or 15 days if using premium) and then turn it permanent with the I-140 after being there in the job.