In another thread you were told your mare was in very poor condition and also appeared to be a yearling. She is absolutely nowhere near, being able to be ridden. She does need lots of ground work first.
Carrots have absolutely nothing to do with whether or not a horse listens to you. Horses probably eat bugs all the time, when eating hay, grain or grazing.
Also in the other thread, you suddenly said your horse might be half Arabian, because she has a thick neck? Her neck is not thick and is in fact, very hollow and thin. Who is feeding you all this BS?
You said you spent $50,000 on this horse but you now think she's crossbred. Something with your posts just do not ring true. I know you have said you are new to horses, but someone is telling you some pretty iffy stuff.
Purchase good books. Do google research on the net for questions or of course, ask here. You likely will get different answers, but go with the answers of people who are long in horses and are knowledgeable.
I think before you even place your mare in the hands of a trainer, she needs to mature and be put in excellent condition. Hopefully she is now in a safer area than previously. Forget riding her but take riding lessons yourself, while she matures.