I have had the same problem with cnh on two of my girls just because they wriggled away into their pen. One of them doesn't like being shown at all and yowls , she just hates being on her own! Have been practising a lot with her but think it may be a hopeless cause!
Typical really, at home she is really loving, can cradle her like a baby in my arms but no-one can get near her at shows. Her sister is the complete opposite, likes a cuddle on her terms at home but loves being shown, sits nicely, doesn't yowl and the judges love her!