Mami makes the connection between negi's disobedience and the attack of the termites. what does this tell you about mami? what does it tell you about negi?

Mami might be telling that disobedience might lead to a situation of unpreparedness such like an attack from termites. If Negi won't be prepared although he has been told to be prepared, he will suffer the consequence.
Mami was cautious of the things that may happen and she makes some analysis on the things that may happen with a negative attitude.

Negi doesn't care about anything so he might encounter problems because of his disobedience.

Her taking a guess here..