You do not have to enter anything about her being disabled unless you pay someone to take care of her while you work. Otherwise, you just enter her as a dependent as a qualified relative and you get the $500 credit for other dependents.
IRS interview to help determine who can be claimed:
https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent
https://ttlc.intuit.com/questions/3113432-who-can-i-claim-as-my-dependent
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
