Current CR is 17:28. I have no doubt in my mind that KT breaks 17:00. The thought of a female breaking 16:00 would once be considered preposterous but given the fact that she ran 16:06 at Ocean State and ran on par with 4:20/9:22 guys, I think it is reasonable that she could break 16:30 and maybe even dip closer to 16:00 at Holmdel.
16:00 for a guy at Holmdel was once considered a huge barrier (back in the late 90s/early 00s).
Holmdel is a tough course but gets easier with experience. I think that is her biggest obstacle.
If she can get through the first mile comfortably in 5:05-5:10, I think she could have a shot at low 16:00 or under. Emphasis on comfortably.
The last mile there can run FAST. A sub 16 would be the greatest high school athletic achievement of all time, greater than Webb's 3:53, Michael Carter's record, even Mary Cain or Mondo Duplantis.