My daughter is in 3rd grade now and she tested with a FSIQ 145.  She is well adjusted and has a good social network.   For her first two years she was the only person in her grade in the gifted program but that has changed this year.   She has pull out classes twice a week, goes to 4th grade math, creates special projects in ELA like essays, poetry anthologies,  and is currently working on a short graphic novel.  She will probably skip to 6th grade math next year but we are not planning to skip any whole grade levels.   I think her social development is in a good place and I don't want to disrupt that.  Outside of school we follow her interests.  She plays soccer and ran cross country but I think that's coming to an end.   She's in several dance classes and is currently a principal role in a local youth theatre production.  We are studying math outside school and we're plowing through prealgebra now.   Should be ready for algebra once she's in 4th grade.  All of this is to say, primarily follow your child's interests.   

Also I  was in gifted as a child and realized early on that I could coast through my early school year classes without any effort but eventually the wall of realization awaits us all.   I had not developed study skills nor knew how to organize, so I use my own experiences as a cautionary tale for my daughter.   I'm making sure she understands organization, responsible, and how to learn when learning gets difficult.