i think you should have shown her the pictures, and make her apologise, i would also refer back to the skin test that should have been done, then she'll be the one thats stupid! dont feel bad!
now il divulge in some old asian secrets for your scalp and hair, olive oil does work but coconut oil is so much better, you'll find it in some pharmacys but realistically go to an asian market and ask for it.
Not only will it hydrate and make your hair glossy but leave it on for a good couple hours or before you have a shower.
Use regularly a couple times a week till its back to normal, and it will be just like it was! not only will it not irrate the scalp but leave your hair glossy, smells nice too! the product itself is a natural oil which for the scalp nourishes it, when your own hair cannot excrete oil for moisture! It is widely used in afro caribbean hair.
try it out otherwise i suggest using heat repair oils/deep conditioners but refrain from strightening hair for a little while! HTHs xoxo