The entire visitation process for the Arizona State Prison Complex (including ASPC Yuma - La Paz Unit) is online: https://www.inmateaid.com/visitation/aspc-yuma-la-paz-unit

Parole violation with possession will probably cause that offender to go back and finish their original sentence with no chance for any good time. The other charges for drugs will probably not add additional time.

The old charges are the problem. The judge will look at priors and that this offender apparently doesn't take the protection order seriously. He could sit for a while with no bail before they even determine what they are looking to offer him. Please remember we are just guessing from the limited information in the question above.

you can call the prison and ask to speak to the mail room

The postcard will get there in a day or two (the mail room staff decides when they will actually hand it out at mail call). The calls are different in every prison/jail. Where is he incarcerated? We will give you an honest estimate if we can help save you money, or not.

Juvenile offenders are not allowed to call anyone but their immediate family, girlfriends are not on that list.

Not likely, however it does happen from time-to-time at institutions across the country. We post stories of women who have compromised the system by having an affair and then doing something that crossed the legal-line. Then they get arrested and become an inmate themselves.

The inmate will need to add you to that list

What are the odds that she gets stopped for a traffic violation? They aren't going to send the US Marshal to find her, but if she screws up, they will have a reason to detain her and notify the county in Oklahoma that issued the warrant. It's not a felony to not pay a fine, there is surely more to this story...

within a day or two