Follow her lead. If she seems happy then I'd probably hold off on the WISC testing for now. The biggest reason that I personally would hold off is that I know the teachers in our board would be highly suspicious looking through a file with 3 tests within a few months and would probably jump to the conclusion that I had shopped around for higher results (I'm not implying that is what you are doing but just that people who don't know that the WPPSI was inappropriate and all of the details about the RAIS would probably look and say hmmmm 2 out of 3 say this score, that is probably more accurate than the third one (assuming it came out higher)).
As a mom who's kid who REALLY needed the gifted program back in grade one but who's WISC scores at the time weren't gifted enough I fully sympathize though. We kind of thought DS's scores might be a low estimate (he was extremely uncooperative at the time) but there wasn't really much we could do (the board only accepts WISC scores). We ended up retesting to confirm the suspected LD a couple years later and his scores easily qualified for the full time gifted program at that point. The extra years in a normal class gave him an extra appreciation of his unique skills and talents (probably too much - I think he started to think he was the smartest person in the world.... haha). We also had other things that he worked through (dealing with frustration, self advocacy, etc). I probably would have been a lot less stressed and appreciated not being called by the school for various things those years but in the end he wasn't permanently scarred by the situation and we made the best of it.
I also have a DD who cruised along quite happily in grade 1. We tested her in grade 2 mostly because of her brother's scores and because we were curious. A few months later in grade 2 she started to show some cracks and she's transferring to DS's school next year. If she had had the same teacher she had in grade 1 and the same classmates I think she would have been fine longer but the grade 2 class didn't have the same mix of kids and the teacher did nothing to add challenge. It will be interesting to see if it is as good of a fit for her as it was for him.
TBH if we hadn't been through all of this stuff with DS we probably wouldn't have been as aware of some of the signs with DD. She kept up a great facade at school but then started letting out her frustration at home. DH and I both had interesting experiences with the education system so that also heightened our awareness while at the same time I totally understand the fun that comes with trying to keep our own baggage to ourselves and not make up issues that aren't there.
So much fun. Hope that you're able to find something that is a reasonable fit for her.
