Hi,
At the outset, it is not recommended to add joint owner if he/she is not contributing to the property.it may not impact your exemption eligibility but may create complications in future. Is there any specific reason you want to include her? If so you can consider showing her share as 1%.
There are several case laws to support that even if you buy a new house in joint ownership, you will be allowed to claim exemption u/s 54. You just need to invest 52 lacs in the new property.
It's recommended to mention the ownership ratio.
Please feel free to call/ revert in case you need more clarity.
Thanks and regards
Abhishek Dugar
CA CS B.Com