If it can't fly cross country she should get a new plane. That said, she doesn't need one capable of carrying dozens of people.
Pelosi, 2 aides, and a small security force is sufficient...she certainly doesn't need a capacity of more than 12-13 people.
This is just my hunch, but I'm betting she wanted one with international capability.
The Gulfstream can surely go cross-country according to the specs.
My only point is that it should be sufficient to take the #3 person in our Gov't out of harm's way or into whatever location necessary for the continuance of our government.
A Challenger would do the job. What plane did Hastert fly?