My experience says you had BEST pay attention to the medical and adding a second feeder in THIS instance is not likely going to fix the issue. If it was simply that... she would have gobbled up the treats at every chance. I've raised too many birds and seen too many things to spend time messing what hasn't been broke for a long time when a new issue presents with NO recent changes.
Chickens hide things as long as they can. If the OP see issues that appear to be inline with possible crop or other blockage issues... time is of the essence. According to the description that ALL was fine until about a week ago... And now even laying is effected...
I don't blame the OP for giving or trying treats... I asked questions to help assess the situation and clarify any misunderstanding... which they did pretty well.
On this public forum... I try to say what I mean and mean what I say, even if it doesn't come out exactly correct... I can't please everybody all the time. But I also try not to get caught up in semantics or overly focus on one word or be easily offended. And when given the opportunity... yes a gentile correction and chance to learn is always welcome!
