These are the requirements for a MO driver’s license.
If she has met these requirements, she is LEGAL to drive in KC Missouri with her Nebraska license:
STEP TWO: Intermediate License
Eligible Age: 16 to 18
You must hold the instruction permit for at least 182 days (beginning the day after issuance).
You may not have any alcohol-related offenses in the last 12 months and no traffic convictions in the last 6 months.
A qualified person or grandparent must accompany you to the license office to verify you have received 40 hours of driving instruction, including a minimum of 10 hours of nighttime driving instruction between sunset and sunrise.
You must pass the vision, road sign recognition, and written tests at a Missouri State Highway Patrol driver examination station if previous results are more than one year old.
You must pass the driving test at a Missouri State Highway Patrol driver examination station.
Your test paper alone is not legal for driving. Be sure to carry your intermediate license with you.
Seat belts must be worn by the driver and all passengers.
Passenger restrictions outlined below may not be applicable to an intermediate license holder who is operating in agricultural work-related activities.
During the first 6 months, you may not operate a motor vehicle with more than one passenger who is under 19 years old and who is not a member of your immediate family.
After the first 6 months, you may not operate a motor vehicle with more than three passengers who are under 19 years old and who are not members of your immediate family.
You may not drive alone between 1:00 a.m. - 5:00 a.m. except to and from a school activity, job, or for an emergency, unless accompanied by a licensed driver 21 years old or older.
To Graduate to an Under-21 Full Driver License:
Your driving privilege cannot be suspended, revoked, or denied at the time of application.
You may not have any alcohol related offenses or traffic convictions within the last 12 months.
The only problems I see are those about the ages and numbers of passengers that will be along on the trip.
She will be legal and unrestricted to drive anywhere in Kansas at 17.
You didn’t say which side of the state line you’d be travelling to. If you come down I-29, you will enter Missouri.
That said, legal is not the same as safe. Have you ridden with her?
At least one of you should have a GPS or a cell phone equipped with same. KC is an easy town to get very lost in. I’m sure I was 19 the first time I drove through there, after driving through St Louis en route from PA. Getting there is only half the fun. I’ve been lost there many times since over the last three decades.