JEE Main

Yes, you will get INR. 50,000 scholarship every year.

Yes, your daughter can get into NIT's but courses which have high demand like CSE won't be available. You just have to check the availability at the time of counselling.

Check this link for JEE Advanced syllabus : https://www.shiksha.com/b-tech/jee-advanced-exam-syllabus?rf=searchWidget&landing=ep
Check this link for JEE Mains syllabubs : https://www.shiksha.com/b-tech/jee-main-exam-syllabus.

I think peter sykes-reaction mechanism is the best book for organic chemistry.

It is very difficult to get NIT/IIT. So, you can try for IIIT, other state government college, private college. Some private colleges are Thapar University, Chandigarh University, BITs, Manipal University, VIT etc.

Sorry. According to me you don't get any nits or iits.
It will be tough to get good government colleges but you can try for some good private colleges. I am attaching a link which will predict the best college according to your rank.
Try the college predictor:
https://www.shiksha.com/jee-mains-college-predictor

The last year the highest closing rank in NIT-H was 235452 in your category in civil engineering in the special round under HS quota. Your expected rank is about 241381. Your chances are moderate. However, JEE Main April can provide you with another chance for improvement.

The candidates who have passed XII examination in 2017, 2018 or appearing in 2019 irrespective of their age can appear in JEE Main examination 2019. The candidates should satisfy themselves about the eligibility of age limit requirements of the Institutes in which he/she is desirous of taking admission.

You will get the admission in NIT, but the branch may or may not be of your preference. It all depends on how you choose the college and the branch.