J.,
I would't get too worried just yet. Although I am not a Dr or therapist at all, I do know from my experience that is is completely normal for a 1 yr old not to be interested in table food. Many kids do not get an interest til much later while others seem to be wolfing down food at 8 months! Every kid is different, it's ok.
As for the gagging on stage 3 foods....my daughter did this as well. I could never get her to eat those processed jarred foods (stage 3) without gagging or choking. What I discovered with my daughter was that it was confusing to her as to whether she was supposed to just swallow or try to chew, since those foods are sort of a 'chunky' soft food. She did fine without gagging on totally pureed foods (similar to stage 1 & 2) but the stage 3 was a mix between a baby food and a solid and she never understood that, even at age 1.
Good luck with the feeding therapist, but don't get too stressed :-) Maybe try some different solids and see if there is any interest.... small chnks of well cooked potato, carrot, frozen peas/corn, honey cheerios, frozen blueberries crackers.... if she still isn't interested that's ok. If she is still breastfeeding, she is still getting very good nutrients and staying healthy anyway.
Best wishes!