A lump in the throat can mean a lot of things. This is where the lymph nodes reside and they will swell if there is a virus, allergic reaction or infection.
This is also a common place to see root tooth infections.
No matter what, you need to see the vet with her tomorrow for an exam.
Let me know if you still have questions.
If you can get her in tomorrow, it would be better. This could be a very simple problem caused by a swollen lymph node. But it's best to investigate it further.