Just keep it organized and simple. I would make up a regimen for her, write the instructions and either get her some of the products or include a product recommendation list. I'm sure she would GREATLY appreciate a step by step list of what she should do daily/weekly to maintain her hair. It would be a very thoughtful gift.
List of necessary products would be (just get only what u need for her regimen):
a prepoo (oil and/or cheap cond)
a moist poo
a clarifying poo
a moist cond
a deep penetrating protein cond
a detangler
a leave-in
setting lotion
an oil
a serum
oil sheen
the products i would choose is:
oil- Vatika coconut oil (or WGHO)
moist poo- CON poo (or nexxus botanoil)
clarifying poo- CON clarifying poo
moist cond- humecto (or EQP DPR-11)
protein- Nexxus emergencee or Keraphix
detangler- pourosity control
leave-in EQP recovery oil
setting lotion - Paul Mitchell medium hold
oil- WGHO or a pure coconut oil
serum - Paul mitchell, kenra, or NTM
oil sheen -Mizani