I generally agree that with your daughter’s national ranking and academic credentials, she should be able to be recruited for the Class of 2021 at most Ivies to the degree these programs have needs in your gender/weapon (WS).
That being said, while you are correct that there are not many 1999 WS candidates, there are quite a few 1998 WS fencers (at least 10) that will be joining elite college teams this fall for the Class of 2020. You will need to see where these 1998 WS fencers land before you can determine what schools have (or don’t have) needs in your daughter’s year.
It is not yet known where all the 1998 WS have committed, however this link should give you some useful data: http://www.fencing.net/forums/threads/unverifiable-rumors-and-dubious-gossip-about-2016-collegiate-incoming-fencers.80644/page-2
A quick look at the current 2015-2016 Ivy fencing rosters indicates the number of current WS team members who will still be on the team when your daughter matriculates in 2017, plus 2 years of attrition (in parentheses)
Harvard
1 (2 current members will have graduated)
Yale
1 (4 current members will have graduated)
Brown
1 (3 current members will have graduated)
Columbia
4 (2 current members will have graduated)
Princeton
4 (2 current members will have graduated)
Penn
2 (4 current members will have graduated)
Cornell
7 (4 current members will have graduated)
While the fencing.net information is not comprehensive, it does show that for the WS Class of 2020: Columbia may be adding 2, Princeton may be adding 1, and Penn may be adding 1, with several other top ranked 1998 WS fencers unaccounted for.
Based on this incomplete dataset and the current rosters, one could guess that Harvard, Yale, and Brown may have the greatest WS needs for the Class of 2021 while Columbia, Princeton, Penn and Cornell may have the least.
Generally most Ivy teams try to have at least 3 fencers per gender/weapon. Harvard, Yale, Princeton and Brown tend to run smaller squads (3-4) and Columbia, Penn and Cornell (4+) historically have had relatively larger ones.
It is worth noting that in @brooklynrye’s earliest posts on this thread, he makes the argument that many of the most highly-ranked fencers typically have their college recruiting commitments well before SN.
Please let us know if this is your experience. Good luck.