Yes, fluid leaks after LP's are not uncommon and as a result, acute pains as you describe can occur although typically they are localized to the LOW BACK (so long as that is where she received the tap).
If on the other hand, she is running any type of FEVER
(>100 degrees F), experiencing stiffness
in the neck where no pain or stiffness existed before, becoming sensitive to noise and light, or having headaches
of a significant variety that are different from the ones you normally see, then, I believe a visit to the ER is definitely warranted.
If she doesn't have the signs of a bacterial or meningitic infection with normal temperature, heart rate
, BP, and so forth then, put a call in to her doctor who did the puncture and get advice.
Also, she should HYDRATE, HYDRATE, HYDRATE, reduce up and about activity for the time being and you should take a look at the area where she had the LP performed if it looks unusually swollen, red, feels hot, or EXQUISITELY TENDER. If any of those are true then, BACK to the ER.
Hope I have answered your query. Let me know if I can assist you further.
Dr Dariush Saghafi, Neurologist