Hello and welcome!
This list is a bit under, a RIM HD is about 2 black longs.
If she wants a RIM HD then she'll work a bit more, since Jammers rarely low unders for headdresses.
If my estimations are correct, she'll need about 1 black long and 2 good longs (examples of good longs blue, red, and purple) and 1 good short (orange and green). (I apologize if I miscalculated)
I sugguest her to trade these items for den betas-
Rainbow Spiked Collar- 1 den beta
Purple Neon Wrist- few RIMs
Pink Neon Spike- Few RIMs-1 clothing beta
Pink Long Wrist- 4 den betas
Rare Mystical spike- Green long
Green Short Spike- 6-7 den betas
Mystical Spiked Collar- few rims - clothing beta
Magenta Spiked Collar -2 den betas
Blue Short Wrist- 2-3 den betas
Blue/Pink Diamond Shop Collar- 2-3 den betas
Silver Spiked Collar- 4 den betas or more (depending on Jammer)
Once your daughter as accumulated enough den betas, then trade them for longs, I recommend to trade them for decent/good longs- (values are listed below)
Decent-
Rare Yellow long- 15 betas
Rare Pink long- 16 betas
Good-
Rare Blue long- 20 den betas
Rare Purple long - 20-23 den betas
Rare Red long- 23-25 den betas
Best
Black long- 3 good longs
This method is extremly effective
If you need to help and have question don't hestiate to contact me or use this Website to research the values of rares~
Helpful links:
https://aj-item-worth.wikia.com/wiki/Rare_Long_Spiked_Collar
https://aj-item-worth.wikia.com/wiki/Diamond_Shop_Spiked_Collars
https://aj-item-worth.wikia.com/wiki/Headdress
Hope this helps~
~Momo (Lofiz on Animal Jam)