Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
It sounds like her iCloud account is loaded on your iPhone. On your iPhone, go to Settings > iCloud. Tap Sign OUt. Then sign in to your iCloud account and this will redownload your contacts back.
If that didn't work, then on your computer, go to www.icloud.com
Login to your iCloud account. Click Settings. You can restore your Contacts and Calenders there.
Please let me know if that didn't work, so I will continue to help you
Hi there, I'm just checking. How is it going ?
On your computer, go to www.icloud.com
Login to your iCloud account. Click Contacts and do you see your Contacts there ?
I'm sorry, I'm afraid you've restored her backup to your iPhone which means you have already erased everything from iPhone. iPhones are very secure, which means the data is erased and the chance of getting them back is slim to none. Your only hope is iCloud backup or iTunes backup on computer if you made one manualy.
So if everything on your iPhone is already replaced with her contents, then you can erase your iPhone and try to restore from backup.
On your iPhone, go to Setting > General > Reset and tap Erase All Contents and Settings. Rememeber, This will erase everything from the iPhone. So if you have any photos or stuffs to be backed up, please back up them to your computer first (to iTunes).
Once it is erased, setup your iPhone and while setting up, you will get an option to restore from iCloud. Do it and make sure you sign in to the Apple ID or iCloud you used with your iPhone. This will allow you to restore your iPhone to your backup from iCloud
Please let me know the results
Chances are you may have a backup made on iCloud. So while setting up, select Restore from iCloud and does it show your backup ?
There is also one more way to get your Contacts back. Go to www.icloud.com
Login to your* iCloud account. Click Settings icon. Scroll down and click Restore Contacts which is under Advanced. Choose a Date before this happened and click Restore. See here --> https://support.apple.com/en-us/HT205018
Have you had your iPhone ever synced with your iCloud before ? No Archives available means no backup available, meaning the contacts were probably not synced to iCloud before.
After erasing the iPhone, did you choose restore from iCloud ?
I'm sorry, that means the contacts and calendars are gone. iPhones are very secure, meaning once the data is erased, it is hard or impossible to get them especially when you restored from backup.
However, download and install a trial version of this application (no need to buy it). Then check if you are able to restore the missing contacts or calendars with it --> https://drfone.wondershare.com/iphone-data-recovery.html