My loved one got put in jail at the border how and who do i call to find out

Was she walking or driving? While crossing.

If she was imprisoned by US customs at the border itself then you need to contact the customs office there. The number should be easily located with a Google search, as this is a large government agency.

Call the Tijuana jail

I would say call the county in the USA where she may have gotten in trouble. That's your best bet. Or as others have said, call the Customs and Border patrol itself.

But if she got arressted at the boarder she would be on this side meaning california right would you happen to have any number i can call