One thing I worry about is that she is already younger than many at her level and is impulsive and emotional by nature and that would make her two years younger and I don't know how mature she will be...
I know that is the struggle most parents on here have but since she is only 3.5 I really don't know how gifted she is. Yes, they gave her tests and some of her abilities are extremely high and none are below what most places call gifted, but she may not be gifted to the point some kids are on here that would require her to actually be in a different grade. She is already past the end of kindergarten expectations and into first grade, but might she one day be in the right place at the "right" grade level?
I've got to run to work, so this will be short, but my dd whom I mentioned above is not PG/DYS. At 7 (after that horrible first grade year) she tested at the upper end of MG on an IQ test. Her achievement scores are all HG+ and she totally refused to complete some of the timed parts of the test, so I'd honestly say that I think that she is more HG than MG but we haven't retested her IQ.
However, she has needed and done well with a grade skip. She, too, was already younger than most in her grade with a late summer/early fall bd. She made the cut-off to start K by 2 weeks. She is now 1-2.5 yrs younger than the kids in her grade and fitting in well socially. She is still at the top of the group in terms of academics -- in the GT/accelerated classes, tested "advanced" on all of the state NCLB tests even the first year following the skip, and still testing in the 99th percentile+ on SRI lexile/reading (the only other achievement testing they've done beyond NCLB).
I wouldn't underestimate your dd's abilities just b/c she is young. She sounds a lot more advanced than my two were at that age and mine are both gifted to some degree or another.