Why is Keychain not working?

I have a MBA running Sierra. This is a teachers laptop and I am signed in under her account. Frequently, the "Accountsd Wants to Use the Login Keychain" message will appear and after I enter the password to the account it will disappear. It doesn't always appear but something prompts it to appear.

Obviously there is no Keychain First Aid anymore so I can't use it. I don't really want to mess around too much with the laptop because it is not mine and I don't want to lose anything saved.

I have already looked at the support document (https://support.apple.com/en-us/HT201609) and I don't know if changing the password for "login" will resolve the issue.

However now I am getting "com.apple.icloudHelper wants to use "login" keychain" message. I don't know if changing the password for "login" as described in the document will resolve ANY keychain message where it wants the password.

Going forward, I need to resolve this issue so it doesn't keep asking and prompting for a password. Then I can return the laptop to the teacher and the Keychain issue will be resolved.

However, I am cautious about doing anything with Keychain because it is not my passwords and related information.