DO not get discouraged. Keep your options open and pursue everything now as if your daughter was to do a full IB Diploma. You will decide later on if it is the best option for her. We also keep it in the open for DS.
Again, I would skip SAT I Math. If your daughter will be applying to profile schools, I would take SAT MATH II at the end of her sophomore year, after she has completed pre-calc. Use the wonderful advice found on this site as to how to get ready for it/ make sure she is ready. Do not listen to your GC - you can register for SAT II yourself. It is however different with AP's, I believe.
I still do not understand the situation with your social studies is. The path most IB kids follow at our school is:
9 - Honors Geography for Life
10 - AP US History
11 - AP European or World History
12 - IB History (SL or HL)
Apparently AP US History aligns wonderfully with SAT US History thus almost no additional studying is required. Take advantage of this!
If you were to follow my advice, your daughter can take two SAT Subject Tests by the end of her sophomore year.
I am in similar shoes as you are, also with a freshman (DA!)and trying to navigate it so my kid can do as much as possible in terms of SAT II tests before the stress of the junior year arrives. He did take pre-calc in 8th grade and had no problems with SAT II Math.
I am not an expert by any means but the advice I got here was extremely valuable. Just trying to share
Our school is not as rigorous as to who can do what. If everything goes well, my kid will be able to take two AP courses this year. Inquire about the possibilities within your school. The fact that nobody does it does not mean that you can't! An example. My kid is taking Physics this year with mostly juniors. There is no rule that you can't take Physics your freshman year, but almost nobody does it here. Do not be afraid to cross some boundaries