THey will send up another plane with external tanks and refuel.
The problem is then they have another one to get down.
Not all the time.
The problem is...if the weather is bad enough to make landing difficult, refueling can also be difficult.
I used to work on the D-704 buddy stores, and we had one come back one time where the drogue basket looked like it had been pushed inside a giant garbage disposal. It was twisted and mangled beyond recognition.
I think the plane had reached bingo fuel and had to divert to Sigonella, and they had to fly a team of people to Sigonella to replace the canopy because it was so gouged up they didn’t want to risk flying it.
Sending up another plane isn’t always the answer..:)