Oh the curse of the BDIS nubain junior, means she is well grown, bigger than her age class, wide, long...hmm sort of like bucklings outgrow their counterparts???

Sorry only half teasing!
Sometimes it's soo overt you can tell by just lifting their tail, with some pressure the penis which looks like a protursion of skin is visible, othertimes the vulva is really tipped up at the end, and you can't even get a lubed pinky in...this with teats like Playtex nurser bottles, short squat and no udder formation like her sisters the same age, and you know you have a problem. Othertimes it's not until you have tried everything that you know at butcher.
At the least do what I am doing with Babbette....CIDR, 21 days later pull the CIDR and give her 1.5 cc IM of PG600 and do the 2cc IM of lutelyse. Pull the CIDR 12 hours later and put her in with the buck. Have 1cc to give IM of cysterellon to give her as the buck breeds her....no heat and you have an incomplete vaginal tract, give up. Vicki