during the update I somehow merged my daughters phone (6) with my phone (5c). How can I undo this?
Are you two using the same Apple ID?
yes
but we always have wasn't an issue until we updated to iOS 9
T'Kesha-
Congratulations on your recent upgrade. Let's make sure you're both able to enjoy your devices. Can you please specify what you're referring to when you mention that you merged your daughter's phone with your phone? Are you receiving your daughter's calls and messages? Keep us posted so we can better assist.
EmmaM_VZWFollow us on Twitter @VZWSupportIf my response answered your question please click the "Correct Answer" button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!
