"I am not finding her."
Translation:Jeg finder hende ikke.
You will find that I am in agreement with you on that being correct English sentence structure.
However, I have found on a few discussions, that there are English speakers, native or not, unfamiliar with that structure, so they deem it wrong or archaic, neither of which are true. What is true, is that it is not common in everyday speak, but then again, neither is the use of "whom".