Now the atmosphere of quick success and instant benefit is very serious, and complaining when something goes wrong seems to be commonplace. This is ignorance. There are many ways to start learning Buddhism. According to your description, the best way for your colleagues to learn is not to complain about others. Hehe, maybe you don't bother to say that she just likes to complain about others before she plans to learn Buddhism to solve it. In fact, learning Buddhism is like learning calligraphy, copying according to the calligrapher's style. Slowly, her calligraphy is getting better and better, and Buddhism has discipline. For example, if you don't complain, for example, if you don't lose your temper, then you will learn Buddhism, and when something goes wrong, you will discipline yourself according to the rules of Buddhism, stop complaining, losing your temper and nagging others. Isn't the purpose of learning Buddhism to purify the mind?
Of course, Buddhism is profound and boundless. If you don't have extraordinary wisdom, you can't do it overnight, but you can learn thousands of miles from the West. If you want to reach that level, you have to take it step by step.
I wanted to recommend some classics to you, but I'm afraid your colleague is a beginner, so it's even worse if you don't like them.
A word of respect: the sea of suffering is boundless, turn back to the shore.