Because she could be coming into heat. It may be early yet. But females can get a bit squirrely when they are coming into heat.
Most trainers do not like having bitches in heat there -- too distracting for the boys.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC