So why is her being pregnant preventing her from seeing an ENT?
Do you know that s/he is going to do something that might be harmful to a pregnancy?
You're going with the idea that "There may be something seriously wrong, but we're not going to do anything because she's pregnant." I would guess if it's something serious, it's not that great for the fetus either.
The idea of Spinal Fluid dripping from her nose, if that's what it is, certainly doesn't sound like something that you should wait on.
In any event, you don't apparantly even know what it is, and no one here is going to hazard a guess.
She needs to go to the doctor. Why are you immediatley starting with the idea of taking her to an ENT? Don't you need a referral for that anyway?
Just take her to her regular doctor and go from there. Could be many other things.