Generally the hair straightening process dama ges the existing shaft and not the roots. Your hair thinning could be early alopecia in females which is reversible if treated on time.
Losing your hair can do serious damage to your self-esteem. Hair loss is very common these days because of increased stress,nutritional deficiencies, lack of exercise and increase intake of junk food. Other causes of hair fall could be genetic, hormonal imbalances, under-active
thyroid gland, and insufficient blood circulation in the scalp.
Home remedies would include oiling your hair more often, include Amla/Indian gooseberry in your diet to promote new hair growth, apple cider vinegar can be effective to control hair fall and it gives soft and manageable hairs.
Next Steps
Visit personally for proper analysis and treatment.
Health Tips
Following blog post should be helpful "Top Causes of Hair Loss and Hair Thinning in Women" by Dr. Jolly Shah Kapadia - https://www.practo.com/healthfeed/top-causes-of-hair-loss-and-hair-thinning-in-women-15052/post"
How to Reduce Hair Loss: 25 Easy Ways!" by Dr. Jolly Shah Kapadia - https://www.practo.com/healthfeed/how-to-reduce-hair-loss-25-easy-ways-25454/post