As you have changed your iCloud password you need to follow these instructions (if you haven't already): What to do after you change your Apple ID or password - Apple Support
After that, the information from Leela may still be there, but no new content should appear. The contacts are probably gone because Leela deleted them.
If the phone you sold was still logged in to your iCloud account that would explain everything.
You've changed your Apple ID password, deleted the contacts, and they came back? Check your Facebook contacts and see if anything has been added there.
Is your iPhone jailbroken? Could someone else know your Apple ID?
Do you have a facebook account?
Yes I do but they’re not my contacts from Facebook as well. They’re total strangers
I’ve changed my password and log out from all devices already, but it doesn’t make a difference.
Have you sold or traded an iOS device at some time in the past?
Yes I did but that was very long ago, and the phone I’m using now is brand new.
Will I be able to remove her info totally from my phone?
Once she is out of the cloud, yes. If you need help with this call AppleCare.
Nope it’s not jail broken and only I know my password. The other person seems to be from another country
Leela roghini is linked to you via iCloud. That is showing the browser history on their device, not yours.
Help! someone has hacked into my phone/apple id and their contacts appeared out of no where in my contacts app and safari browser as well