I guess I am just trying to figure a way to let this woman know what level he is actually at. That he is gifted for sure and not just borderline. I don't know how to make her understand that in a gentle way. But unless she is on the same page the discussion will not really help me IYKWIM.
JMO, but I would just approach this first meeting as a parent who has reason to suspect her child is gifted, and focus on asking for information about what services your school district offers to gifted children. One of the things you'll want to ask is whether or not (and at what age) the district will screen a child for gifted services and (if you want to) ask that your ds be screened.
The person you're talking with may ask questions about your ds and she may also minimize what you say simply because you're a parent (or she might not), but the only way (in my experience) that you'll be able to get your child into a school district gifted program is to have him tested (either through the school district or privately).
In our school district (and I think this is true elsewhere), a parent can request the gifted program screening. The district doesn't publicize this but all you have to do is put the request in writing and they'll do it.
One other note - it sounds like your ds is exceptionally gifted and he's clearly ahead academically at this point. I wouldn't necessarily put that forward to the person you talk to as "proof" of his IQ being exceptional, just let the person know this is where he's at re achievement at this point in time. You might think of some of the ideas your ds has had or some of the things he's done outside of academics that point to giftedness to mention.
Good luck with your meeting!
polarbear