Thank you but still doesn't work. Is it possible that is a problem because she use"@" in her password. If she use web mail it works.Set the correct password on the account settings; "Options" -> "Account settings".
Also for pop?Gmail now insists using OAuth in Thunderbird.
Here's a how-to I found that should help: https://www.supertechcrew.com/thunderbird-oauth2-gmail/