There's not a huge selection of helmets that are both available for a 21.5" size and also are HANS-Ready, but we do have a few that are:
SA2010 Rated
White or Black
HANS-Ready
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HANS:
A HANS device is optional for this class. If the price is too much you may consider simply going with a instead.
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Suit:
Size: Small
Color: Black
SFI-Rated / Single Layer
Size: Small
Color: Black,Blue,Red
SFI-Rated / Multi-Layer
Size: Medium
Color: Black,Blue,Red
SFI-Rated / Multi-Layer
Lightweight
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Gloves:
Size : Small? ()
Color : Blue,Red,Black,White
SFI-Rated
Size : X-Small? ()
Color : Blue,Red,Black
SFI-Rated
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Shoes:
Men's Size: 8.0
Color: Black
SFI-Rated
Men's Size: 8.0
Color: Black/White or Red/White
SFI-Rated
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Arm Restraints:
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Though, it's not required, you might also consider a fire retardant and for additional fire protection. Of course, the items I've listed here aren't the only ones that meet the criteria we are looking for. If you don't see what you are looking for just let me know and I'll find some others for you.
Any of the above should work out great for her and I wouldn't hesitate to recommend any of these brands to you. I have used all of these brands before in the amateur track days I attend. I am a bit partial to the "style" of Oakley, but that's purely subjective.
I always enjoy helping others get into the sport- just let me know what questions you or what you are thinking and I'll be more than happy to help!