@GodGinrai My comments began with me putting it into the context of OUR world and then using that to allow the idea that it may work in a similar manner in this world. This would explain her arrogance.
This tiny dragon still fits when you take into account that it will be stronger than it is now when its larger. This situation is much like the comparison of a Monkey to a human. Both fall under similar titles but a smaller Monkey has massively more strength than a larger human. There is still the generalization that things are generally stronger when larger. If the monkey was larger it would be stronger, within certain physical limits of course. Her assumption that this small dragon and its tiny breath would be beaten make sense if she does not understand there is such an unusual difference. Humans are after all unusually weak physically. If you compare apes and such the bigger one is likely stronger.
This is not comparing apples and oranges. This is in the context of Apples and other types of hard fruit like an apple. Pears perhaps.
This was my point or atleast my attempt to get you to understand my initial point. If she was facing a spirit she would likely assume different scaling than a slime but it may still hold true that a larger spirit is stronger. With large enough differences in size the advantages of unusually strong creatures also get out done. Thats why a Gorilla is only strong within a relative weight class. You increase a creatures size enough and it will be stronger. Even poisons will lose effect on larger animals because they are too large, even if there are poisons so potent that nothing is large enough this does not change. At that point you just start talking about doses of poison which is making the poison larger or smaller to increase or decrease its lethality.
Once again it does not matter if this particular creature is unusually strong or has special weapons. My point was not that it should be weaker because its smaller. My point was that her assumptions on strength to size ratio's made a certain amount of sense.