I'm not sure how you could do that - 1. because she is 18 and 2. she probably won't see her public defender until the day before she goes to court.
You could /would have to get her to sign a notarized document giving you permission to discuss her case with the PD's (public defenders) office. That in itself will take a while because you will have to talk to her, find out who her caseworker in prison is and then get her to tell them it's okay for you to get a paper to her to sign giving you permission to discuss anything with a PD. (dizzy now?)
Then you'd have to send the paper to be signed to her caseworker in jail, if they don't loose it, have her sign it, find a notary public and sign - then send it to you. You copy it, and take it to the PD's office - but at this point they probably have NOT assigned anyone to her case. Like I said - it's most times day before they speak to you. Then it's DO what I say - take this deal - take the plea.
Sometimes you can call the PD's office and get a sympathetic ear but don't bank on it.
IF you hire a private attorney for a burglary case you are probably looking at upwards of 15,000.00 to start. If you have the money I'd go that route and let an atty. deal with the courts and her mental illness state. If she has conduct disorder and ADHD? Good luck - we talked to a few attorneys and said that ADHD is NOT considered a "mental" illness by any court - it's a condition controlled with medications, and Conduct Disorder was a fancy term for "wayward" teen. In our county there were NO sympathetic ears. We did get the paper, we did leave 100 messages with the PD, we DID go to his office only to have him skate out the back door every time we sat there to see him, and when he FINALLY went the night before court? HE KNEW and SAW the casefile, 2 file boxes thick - he had messages from our sons caseworker - and letters from our sons therapist.
It meant nothing to them - they held him in jail at 16 until he turned 17, tried him as an adult.
Also no legal place takes criminal cases on a Pro-Bono basis.
I'm not saying it's hopeless - I'm just telling you with her age and the system you have your work cut out for you.