Six Points URJ camps have 12-day sessions starting in late June.

My social 4th grader will be at Camp Letts early August--she loves it there!

Thanks for the recs everyone!

Netimus, Hidden Meadows, Echo Hill, Sandy Hill, Camp Letts - all the usual suspects

Frost Valley in New York does 12 day sessions. Things are filling up, but it looks like some sessions still have openings.
https://frostvalley.org/

DD has gone for several years, loved each year more and more!

And just to add a few more Girl Scout options, you could look at some adjacent councils that have been suggested here recently given the shortage of GS camp options in our council. But you might be looking for other types of camp, especially if you're looking for something with an option to stay longer in the future. Just thought I'd share some choices:

Girl Scouts of Chesapeake Bay: https://www.gscb.org/en/Camp/summer-camp.html
Girl Scouts of Central Maryland: https://www.gscm.org/en/camp/SummerCamp.html
Girl Scouts of Eastern Pennsylvania (seems to have a lot of different options): https://www.gsep.org/en/camp/camp/resident-camps.html

Girl Scouts is still running sleepaway camp at Potomac Woods for that age group this summer. The initial lottery is over, so most spots are filled, but they will be opening registration again on Thursday, March 3, for remaining spots, so you can check then to see if there's anything available and appealing. Remember if you sign up there, they do it based on this year's grade, so you'd be looking for spots for current 3rd graders.

looking for sleep away camp for one highly social rising 4th grade girl the week June 26- July 1, and possibly one or two weeks late July/early AUgust someplace here or in Northeast [vermont, main?] where if, as expected she likes it, she could go for 3-4 weeks next summer. Just realized Girl Scouts camp winona is not sleep away this year....scrambling to come up with a plan B.