Immigration question regarding a US citizen, working abroad, travelling to US with fiance travelling separately

I am currently a US citizen working and living abroad in another country. Later this year I will be traveling to the US to attend an academic conference. Tied into the end of the conference I will be taking a vacation in the US. My fiance, who is from the country I currently live and work in, will be arriving roughly 5 days after I already arrived.
We are staying in an AirBNB for the first 2 days, which I have reserved for the conference, going to Vegas to get married (planned not confirmed), and then travelling around the US by car as a sort of road trip, so I don't really have plans to book hotels for the whole entire trip. As whether we stop and find a hotel will often be reliant on whether or not I feel safe to continue driving for that day. We are returning to her country after about a week (following the conference).
I am a little bit worried when she gets to immigration and they ask for hotel proof this may cause problems since I will not be with her to help corroborate the story.
As a note she does have a valid a travel visa for the US and a return ticket booked.
Is it likely she will have any trouble getting through immigration in this scenario?
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Can I travel to USA to visit my fiancé?
Yes \u2013 your fianc\xe9 may visit the US, so long as they have a valid B-1/B-2 visa or ESTA. However, your fianc\xe9 should expect more scrutiny at the border. Filing a K-1 fianc\xe9 visa application is evidence that your fianc\xe9 intends to travel to the US and remain there as a permanent resident.How long after marrying a U.S. citizen can I travel?
After you marry a U.S. citizen, you can apply for a green card. While USCIS is processing your application, you can apply for \u201cadvance parole,\u201d which gives you permission to travel. Unless you have an emergency situation, USCIS will take two to three months to process your parole.Do you have to be engaged to apply for a fiancé visa?
To be eligible for a fianc\xe9 visa, the law requires that you: intend to marry a U.S. citizen, have met your intended spouse in person within the last two years (though this can be waived based on cultural customs or extreme hardship), and. are legally able to marry.Can someone with a work visa travel outside the US?
Can I still use the work authorization card to travel? If you were only approved for work authorization, you CANNOT use the card to travel outside of the US. The card will only be valid for working in the US and not traveling outside of the US.Five Mistakes NOT to Make at your Immigration Interview
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