It is very likely that your daughter is also gifted if her older brother is. Though it may "show" itself differently.
You have every right to be concerned and even though you are not "that parent" others may misunderstand, but you still have to do what you can for your daughter.
Do you know what the plan is for K class? What will they be learning? What is daughter already capable of?
I'm sure more people will chime in soon with more experience. If you have options for change, then definitely consider them. Many gifted children don't necessarily need to be in K at all. (A rather vague statement, sorry, but ... many don't need it as they already know everything in K when they were 3-4 years old.)
So, depending on your situation ...
