Signed out of iPad and my wife signed in with her Apple ID/password, but some things still require my ID/password… app updates for example. Messaging on the iPad seems to have both of our phones synced to it. How do you completely remove one user?
That is because the device was not erased so she could set it up for herself. All apps downloaded under your Apple ID will continue to require your Apple ID password to update because they are nontransferable.
The best solution is to erase the iPad and have her set it up again under her account information, this will help with the messages issue, too. How to erase all content and settings - Apple Support
Then you can invite her to Family Share so she can still use any paid apps for herself, but under her Apple ID instead. Set up Family Sharing - Apple Support
That is because the device was not erased so she could set it up for herself. All apps downloaded under your Apple ID will continue to require your Apple ID password to update because they are nontransferable.
The best solution is to erase the iPad and have her set it up again under her account information, this will help with the messages issue, too. How to erase all content and settings - Apple Support
Then you can invite her to Family Share so she can still use any paid apps for herself, but under her Apple ID instead. Set up Family Sharing - Apple Support
After signing in with different Apple ID, app updates still require the previous ID/password
