
If you are totally new to showing then I would say that Ringcraft is a must. She should make it clear at the club that shw knows nothing about showing so that trainers will be able to tell ehr when she is moving at corredt speed for her dogs, when they are stood properly shoing off to advantage, adn most importantly the ogs will get used to and happily accept complete strangers feeling all over its bosy, checking for entirety and examining the mouth while remaining in a composed stance.
As for classes to enter I would advise to enter the lowest class that the dog is elligilble for, and maybe two mixed breed classes if at a general show. This will give the exhibit a chance to gain ring experience, among it's own b4reed and with the distraction of other breeds.
At club shows there are usually lots of classes and it is usual to enter several.