Hello. Yes, definitely there is reservation for single girl child. If you are considering NEET, then you should be having no brother or sister. You should be the only child of your parents.

Twin sister is allowed. No issue with that. This criteria is available to 1% state level quota. Kindly check once with the colleges.

Careers360 has provided the list of colleges.

https://medicine.careers360.com/colleges/list-of-government-medical-colleges-in-rajasthan-accepting-neet

Hope that helps!