This fall is a VERY long way away for your little girl; if you are 25 years old, that would be equivalent to more than two years for you.
It sounds like you are training her because YOU are ready. Since she's not interested in or connecting with any of your methods, she may not be ready to "get it" yet. That results in a great deal of failure and frustration for both of you to deal with, and for her, resentment and aversion as well. Kids will train in a matter of a few days to a couple of weeks when they are ready, and they do it because they want to, just like walking and talking.
I'll bet if you were to remove all pressure, other than the positive emotional work you can do with her by reading potty books, playing make-believe with her dolls and puppets, demonstrating how free and easy you feel because you can simply use the potty, etc., she'll get there faster than if you keep pushing, urging, and reminding.
Be aware that although 3.5 is not early for training, many kids need until then or even until 4 before they have all their physical and emotional factors for success ready to kick in. And for many kids, pee and poop training are two separate steps, with different physical sensations and different emotional components.
I don't think you'll lose any ground if you relax or even back away from the training completely. Just stay positive and cheerful. If you use the search box above, you'll find many stories by moms whose kids suddenly got it after the pressure to achieve was removed.