TX has no state income tax so TX is not an issue. The fact that she has a TX drivers license or voter registration is irrelevant. She needs to file part year returns for IL and PA. She lived and worked in IL and in PA during 2023 and is subject to paying tax in both of those states.
https://ttlc.intuit.com/questions/1901227-how-do-i-file-a-part-year-state-return
https://ttlc.intuit.com/questions/1901560-how-do-i-file-if-i-moved-to-a-different-state-last-year
**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.**
