(1) Can we change her name now?
(2) If we can (should we need to perform aqiqah again for new naming?
(3) Can you share hadith reference on subject matter?
بسم الله الرحمن الرحيم
If you want to change the name of your daughter, you may do so. There is no need of performing aqiqah again after changing the name. We could not find any hadith stating performing aqiqah again after changing the name.
Allah knows Best!
Darul Uloom Deoband