I am nearly done with a PHD in an engineering field. The concepts are TOUGH, abstract and filld with complex math.
My wife is a DPT, and I recall her hard times going through that. She lost at least 50% of her class, so one has to realize that they do make it tough to weed out the weaker students. But to me at least, that alone is a motivator.
Look at your signature line... "A creative man is motivated by the desire to achieve, not by the desire to beat others.
Ayn Rand".
That desire to achieve is why she is feeling bad, so she needs to just channel the energy in a positive way and use it to work harder and excel. My wife had to know all kinds of crazy stuff in DPT school. Neuro-related classes as I recall were the hardest. Its not a cakewalk, and you really need to know the down and dirty details of all aspects of the Human body, both from a physical standpoint, but also all the medical stuff like a doctor has to learn, because it is a matter of treatment with and around a lot of the same ailments.
Here is a perspective... Ive heard that Chemical Engineering is harder than Med school academically. Ive done it at a top 10 program undergrad, and got through it, and now am finishing up my doctorate. Looking back at all the stuff that my wife had to learn in what amount of time doing her DPT, both the breadth of info, the amount of it, the timescale to master it all and also build the professional knowledge, it was TOUGH and I never envied her schedule, the material she had to learn, or anything else, despite coming from a tough set myself. It was hard stuff. So she really is in a tough field, that is very challenging and takes a lot to get through. I think she should be proud to be in the program and be getting through. One failure is just something to chalk up to experience. Learn from it, channel the energy, and run with it.
She isnt doing something easy. She needs to remember that.
Good luck to her.