Hello! I understand your situation and I'll do my best to help you with unlocking the iPhone 4s. It seems like you are facing an activation lock issue, which requires the previous owner's Apple ID and password to unlock the device. Since you don't have access to that information, there are a few things you can try:
1. Contact the Previous Owner: If possible, try to reach out to the previous owner and explain your situation. They may be able to help you unlock the device by removing it from their iCloud account.
2. Apple Support: You can contact Apple Support and explain your situation. They may ask for proof of ownership and help you unlock the device.
3. Third-Party Unlocking Services: There are third-party services that claim to unlock iPhones, but be cautious as some of them may not be legitimate. It's always best to do thorough research before using any third-party service.
4. DFU Mode: You can try putting the iPhone into DFU (Device Firmware Update) mode and restoring it using iTunes. However, this method may not work if the activation lock is enabled.
Remember, it's important to ensure that any method you use to unlock the device is legal and legitimate. I hope one of these options helps you unlock the iPhone 4s for your daughter. Good luck, and let us know if you have any other questions or need further assistance!