In the LN not long after this Yumiella will go splunking trying to find equipment strong enough to withstand her strength so she can power up further. What she found instead was a light aspected weapon, which she sold cause she can’t use it, but she did mention that this could potentially hurt her. This weapon later ended up with the kingdom and later Alicia.
When they went to fight the demon lord Alicia stabbed Yumiella from the back with that weapon because to her Yumiella is scarier than the demon lord. Part of the reason is this arc.
Yumiella didn’t die because Patrick told Yumiella to wear the charm that prevent a lethal hit. The charm that Yumiella has not worn so far in the story because she thinks it would be inefficient.
After Yumiella zapped the demon king, Alicia cannot be publicly punished, but she is made to clear dungeons as punishment (and to level up) in part because she is still an important asset to the country and some echelons in the country thought that she could be a trump card if Yumiella decided to rebel.
In a later arc, she couldn’t take it anymore and tried to defect to a neighboring hostile country only to encounter Yumiella again and get more traumatized. She then returned to the kingdom to continue her punishment cause at that point is just waaay to scared of crossing Yumiella. At this point the country also realized that if Yumiella decided to go against them any resistance with force would be futile.