Considering this is an isekai-style fantasy world the mom's attitude isn't really unreasonable. A weak-ass lvl 3 human with no cheat abilities is liable to get killed at any moment by random fauna or bandits. If anything the kid is nuts.
Boy, just give up. She's either coming or destroying. Make a compromise and suck it up. Heck, have her teach you the ropes, learn what it takes to be better. A lot of good characters learn from dragons